diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/DescriptorBasedProperty.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/DescriptorBasedProperty.kt
index c50fd847e47..f2e42cd5d12 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/DescriptorBasedProperty.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/DescriptorBasedProperty.kt
@@ -21,7 +21,7 @@ import java.lang.reflect.Field
 import kotlin.reflect.jvm.internal.JvmPropertySignature.JavaField
 import kotlin.reflect.jvm.internal.JvmPropertySignature.KotlinProperty
 
-abstract class DescriptorBasedProperty<out R> protected constructor(
+internal abstract class DescriptorBasedProperty<out R> protected constructor(
         internal val container: KDeclarationContainerImpl,
         name: String,
         signature: String,
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KAnnotatedElementImpl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KAnnotatedElementImpl.kt
index 57e2d1fe204..9bc0b850407 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KAnnotatedElementImpl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KAnnotatedElementImpl.kt
@@ -20,7 +20,7 @@ import org.jetbrains.kotlin.descriptors.annotations.Annotated
 import org.jetbrains.kotlin.load.kotlin.reflect.ReflectAnnotationSource
 import kotlin.reflect.KAnnotatedElement
 
-interface KAnnotatedElementImpl : KAnnotatedElement {
+internal interface KAnnotatedElementImpl : KAnnotatedElement {
     val annotated: Annotated
 
     override val annotations: List<Annotation>
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KCallableImpl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KCallableImpl.kt
index 42ec1985f57..4ae44a55b75 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KCallableImpl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KCallableImpl.kt
@@ -26,7 +26,7 @@ import kotlin.reflect.KType
 import kotlin.reflect.KotlinReflectionInternalError
 import kotlin.reflect.jvm.javaType
 
-interface KCallableImpl<out R> : KCallable<R>, KAnnotatedElementImpl {
+internal interface KCallableImpl<out R> : KCallable<R>, KAnnotatedElementImpl {
     val descriptor: CallableMemberDescriptor
 
     val caller: FunctionCaller<*>
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KClassImpl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KClassImpl.kt
index d9416cb16ae..0d49a45cdd4 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KClassImpl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KClassImpl.kt
@@ -37,7 +37,7 @@ import kotlin.reflect.KClass
 import kotlin.reflect.KFunction
 import kotlin.reflect.KotlinReflectionInternalError
 
-class KClassImpl<T : Any>(override val jClass: Class<T>) : KDeclarationContainerImpl(), KClass<T>, KAnnotatedElementImpl {
+internal class KClassImpl<T : Any>(override val jClass: Class<T>) : KDeclarationContainerImpl(), KClass<T>, KAnnotatedElementImpl {
     val descriptor by ReflectProperties.lazySoft {
         val classId = classId
 
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KDeclarationContainerImpl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KDeclarationContainerImpl.kt
index d9a37fc547e..7c6a01b5cf8 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KDeclarationContainerImpl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KDeclarationContainerImpl.kt
@@ -36,7 +36,7 @@ import kotlin.jvm.internal.ClassBasedDeclarationContainer
 import kotlin.reflect.KCallable
 import kotlin.reflect.KotlinReflectionInternalError
 
-abstract class KDeclarationContainerImpl : ClassBasedDeclarationContainer {
+internal abstract class KDeclarationContainerImpl : ClassBasedDeclarationContainer {
     // Note: this is stored here on a soft reference to prevent GC from destroying the weak reference to it in the moduleByClassLoader cache
     val moduleData by ReflectProperties.lazySoft {
         jClass.getOrCreateModule()
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KFunctionFromReferenceImpl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KFunctionFromReferenceImpl.kt
index 71e9b8c5b3a..ab201008e76 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KFunctionFromReferenceImpl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KFunctionFromReferenceImpl.kt
@@ -24,7 +24,7 @@ import kotlin.jvm.internal.FunctionReference
 import kotlin.reflect.KCallable
 import kotlin.reflect.KotlinReflectionInternalError
 
-class KFunctionFromReferenceImpl(
+internal class KFunctionFromReferenceImpl(
         val reference: FunctionReference
 ): KFunctionImpl(
         reference.getOwner() as? KDeclarationContainerImpl ?: EmptyContainerForLocal,
@@ -62,7 +62,7 @@ class KFunctionFromReferenceImpl(
     override fun invoke(p1: Any?, p2: Any?, p3: Any?, p4: Any?, p5: Any?, p6: Any?, p7: Any?, p8: Any?, p9: Any?, p10: Any?, p11: Any?, p12: Any?, p13: Any?, p14: Any?, p15: Any?, p16: Any?, p17: Any?, p18: Any?, p19: Any?, p20: Any?, p21: Any?, p22: Any?): Any? = reference(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15, p16, p17, p18, p19, p20, p21, p22)
 }
 
-object EmptyContainerForLocal : KDeclarationContainerImpl() {
+internal object EmptyContainerForLocal : KDeclarationContainerImpl() {
     override val jClass: Class<*>
         get() = fail()
 
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KFunctionImpl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KFunctionImpl.kt
index edd1d89a6b9..42f82c6d4aa 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KFunctionImpl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KFunctionImpl.kt
@@ -30,7 +30,7 @@ import kotlin.reflect.jvm.internal.JvmFunctionSignature.JavaConstructor
 import kotlin.reflect.jvm.internal.JvmFunctionSignature.JavaMethod
 import kotlin.reflect.jvm.internal.JvmFunctionSignature.KotlinFunction
 
-open class KFunctionImpl protected constructor(
+internal open class KFunctionImpl protected constructor(
         private val container: KDeclarationContainerImpl,
         name: String,
         signature: String,
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPackageImpl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPackageImpl.kt
index 726c9e23228..3d2bea1fb81 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPackageImpl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPackageImpl.kt
@@ -27,7 +27,7 @@ import kotlin.jvm.internal.KotlinPackage
 import kotlin.reflect.KCallable
 import kotlin.reflect.KPackage
 
-class KPackageImpl(override val jClass: Class<*>, val moduleName: String) : KDeclarationContainerImpl(), KPackage {
+internal class KPackageImpl(override val jClass: Class<*>, val moduleName: String) : KDeclarationContainerImpl(), KPackage {
     val descriptor by ReflectProperties.lazySoft {
         val moduleData = jClass.getOrCreateModule()
         moduleData.packageFacadeProvider.registerModule(moduleName)
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KParameterImpl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KParameterImpl.kt
index 9c3410d3f04..cae8344ef27 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KParameterImpl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KParameterImpl.kt
@@ -23,7 +23,7 @@ import org.jetbrains.kotlin.resolve.descriptorUtil.hasDefaultValue
 import kotlin.reflect.KParameter
 import kotlin.reflect.KType
 
-class KParameterImpl(
+internal class KParameterImpl(
         val callable: KCallableImpl<*>,
         override val index: Int,
         override val kind: KParameter.Kind,
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty0Impl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty0Impl.kt
index 8124bb802f8..165a35e74e1 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty0Impl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty0Impl.kt
@@ -22,7 +22,7 @@ import kotlin.jvm.internal.PropertyReference0
 import kotlin.reflect.KMutableProperty0
 import kotlin.reflect.KProperty0
 
-open class KProperty0Impl<out R> : DescriptorBasedProperty<R>, KProperty0<R>, KPropertyImpl<R> {
+internal open class KProperty0Impl<out R> : DescriptorBasedProperty<R>, KProperty0<R>, KPropertyImpl<R> {
     constructor(container: KDeclarationContainerImpl, descriptor: PropertyDescriptor) : super(container, descriptor)
 
     constructor(container: KDeclarationContainerImpl, name: String, signature: String) : super(container, name, signature)
@@ -36,7 +36,7 @@ open class KProperty0Impl<out R> : DescriptorBasedProperty<R>, KProperty0<R>, KP
     }
 }
 
-open class KMutableProperty0Impl<R> : KProperty0Impl<R>, KMutableProperty0<R>, KMutablePropertyImpl<R> {
+internal open class KMutableProperty0Impl<R> : KProperty0Impl<R>, KMutableProperty0<R>, KMutablePropertyImpl<R> {
     constructor(container: KDeclarationContainerImpl, descriptor: PropertyDescriptor) : super(container, descriptor)
 
     constructor(container: KDeclarationContainerImpl, name: String, signature: String) : super(container, name, signature)
@@ -51,7 +51,7 @@ open class KMutableProperty0Impl<R> : KProperty0Impl<R>, KMutableProperty0<R>, K
 }
 
 
-class KProperty0FromReferenceImpl(
+internal class KProperty0FromReferenceImpl(
         val reference: PropertyReference0
 ) : KProperty0Impl<Any?>(
         reference.owner as KDeclarationContainerImpl,
@@ -64,7 +64,7 @@ class KProperty0FromReferenceImpl(
 }
 
 
-class KMutableProperty0FromReferenceImpl(
+internal class KMutableProperty0FromReferenceImpl(
         val reference: MutablePropertyReference0
 ) : KMutableProperty0Impl<Any?>(
         reference.owner as KDeclarationContainerImpl,
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty1Impl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty1Impl.kt
index b95760b773c..ab1dd395595 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty1Impl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty1Impl.kt
@@ -22,7 +22,7 @@ import kotlin.jvm.internal.PropertyReference1
 import kotlin.reflect.KMutableProperty1
 import kotlin.reflect.KProperty1
 
-open class KProperty1Impl<T, out R> : DescriptorBasedProperty<R>, KProperty1<T, R>, KPropertyImpl<R> {
+internal open class KProperty1Impl<T, out R> : DescriptorBasedProperty<R>, KProperty1<T, R>, KPropertyImpl<R> {
     constructor(container: KDeclarationContainerImpl, name: String, signature: String) : super(container, name, signature)
 
     constructor(container: KDeclarationContainerImpl, descriptor: PropertyDescriptor) : super(container, descriptor)
@@ -36,7 +36,7 @@ open class KProperty1Impl<T, out R> : DescriptorBasedProperty<R>, KProperty1<T,
     }
 }
 
-open class KMutableProperty1Impl<T, R> : KProperty1Impl<T, R>, KMutableProperty1<T, R>, KMutablePropertyImpl<R> {
+internal open class KMutableProperty1Impl<T, R> : KProperty1Impl<T, R>, KMutableProperty1<T, R>, KMutablePropertyImpl<R> {
     constructor(container: KDeclarationContainerImpl, name: String, signature: String) : super(container, name, signature)
 
     constructor(container: KDeclarationContainerImpl, descriptor: PropertyDescriptor) : super(container, descriptor)
@@ -51,7 +51,7 @@ open class KMutableProperty1Impl<T, R> : KProperty1Impl<T, R>, KMutableProperty1
 }
 
 
-class KProperty1FromReferenceImpl(
+internal class KProperty1FromReferenceImpl(
         val reference: PropertyReference1
 ) : KProperty1Impl<Any?, Any?>(
         reference.owner as KDeclarationContainerImpl,
@@ -64,7 +64,7 @@ class KProperty1FromReferenceImpl(
 }
 
 
-class KMutableProperty1FromReferenceImpl(
+internal class KMutableProperty1FromReferenceImpl(
         val reference: MutablePropertyReference1
 ) : KMutableProperty1Impl<Any?, Any?>(
         reference.owner as KDeclarationContainerImpl,
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty2Impl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty2Impl.kt
index 9ce7cb196fd..79f529b99ae 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty2Impl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty2Impl.kt
@@ -20,7 +20,7 @@ import org.jetbrains.kotlin.descriptors.PropertyDescriptor
 import kotlin.reflect.KMutableProperty2
 import kotlin.reflect.KProperty2
 
-open class KProperty2Impl<D, E, out R> : DescriptorBasedProperty<R>, KProperty2<D, E, R>, KPropertyImpl<R> {
+internal open class KProperty2Impl<D, E, out R> : DescriptorBasedProperty<R>, KProperty2<D, E, R>, KPropertyImpl<R> {
     constructor(container: KDeclarationContainerImpl, name: String, signature: String) : super(container, name, signature)
 
     constructor(container: KDeclarationContainerImpl, descriptor: PropertyDescriptor) : super(container, descriptor)
@@ -34,7 +34,7 @@ open class KProperty2Impl<D, E, out R> : DescriptorBasedProperty<R>, KProperty2<
     }
 }
 
-class KMutableProperty2Impl<D, E, R> : KProperty2Impl<D, E, R>, KMutableProperty2<D, E, R>, KMutablePropertyImpl<R> {
+internal class KMutableProperty2Impl<D, E, R> : KProperty2Impl<D, E, R>, KMutableProperty2<D, E, R>, KMutablePropertyImpl<R> {
     constructor(container: KDeclarationContainerImpl, name: String, signature: String) : super(container, name, signature)
 
     constructor(container: KDeclarationContainerImpl, descriptor: PropertyDescriptor) : super(container, descriptor)
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPropertyImpl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPropertyImpl.kt
index 7a27e7db248..f9629a7cd24 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPropertyImpl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPropertyImpl.kt
@@ -25,10 +25,10 @@ import java.lang.reflect.Modifier
 import kotlin.reflect.KMutableProperty
 import kotlin.reflect.KProperty
 
-interface KPropertyImpl<out R> : KProperty<R>, KCallableImpl<R> {
-    val javaField: Field?
+internal interface KPropertyImpl<out R> : KProperty<R>, KCallableImpl<R> {
+    internal val javaField: Field?
 
-    val container: KDeclarationContainerImpl
+    internal val container: KDeclarationContainerImpl
 
     override val getter: Getter<R>
 
@@ -63,7 +63,7 @@ interface KPropertyImpl<out R> : KProperty<R>, KCallableImpl<R> {
 }
 
 
-interface KMutablePropertyImpl<R> : KMutableProperty<R>, KPropertyImpl<R> {
+internal interface KMutablePropertyImpl<R> : KMutableProperty<R>, KPropertyImpl<R> {
     override val setter: Setter<R>
 
     abstract class Setter<R> : KPropertyImpl.Accessor<R>(), KMutableProperty.Setter<R>, KCallableImpl<Unit> {
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KTypeImpl.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KTypeImpl.kt
index 5dd64947279..e2f042051b3 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KTypeImpl.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/KTypeImpl.kt
@@ -20,7 +20,7 @@ import org.jetbrains.kotlin.types.JetType
 import java.lang.reflect.Type
 import kotlin.reflect.KType
 
-class KTypeImpl(
+internal class KTypeImpl(
         val type: JetType,
         computeJavaType: () -> Type
 ) : KType {
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/ReflectionObjectRenderer.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/ReflectionObjectRenderer.kt
index 852960034a6..48ff1e1f079 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/ReflectionObjectRenderer.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/ReflectionObjectRenderer.kt
@@ -24,7 +24,7 @@ import org.jetbrains.kotlin.renderer.DescriptorRenderer
 import org.jetbrains.kotlin.types.JetType
 import kotlin.reflect.KParameter
 
-object ReflectionObjectRenderer {
+internal object ReflectionObjectRenderer {
     private val renderer = DescriptorRenderer.FQ_NAMES_IN_TYPES
 
     private fun StringBuilder.appendReceiverType(receiver: ReceiverParameterDescriptor?) {
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/RuntimeTypeMapper.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/RuntimeTypeMapper.kt
index a195ee3b671..aa393b87248 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/RuntimeTypeMapper.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/RuntimeTypeMapper.kt
@@ -43,7 +43,7 @@ import java.lang.reflect.Member
 import java.lang.reflect.Method
 import kotlin.reflect.KotlinReflectionInternalError
 
-sealed class JvmFunctionSignature {
+internal sealed class JvmFunctionSignature {
     abstract fun asString(): String
 
     class KotlinFunction(
@@ -80,7 +80,7 @@ sealed class JvmFunctionSignature {
     }
 }
 
-sealed class JvmPropertySignature {
+internal sealed class JvmPropertySignature {
     /**
      * Returns the JVM signature of the getter of this property. In case the property doesn't have a getter,
      * constructs the signature of its imaginary default getter. See CallableReference#getSignature for more information
@@ -116,7 +116,7 @@ sealed class JvmPropertySignature {
     }
 }
 
-object RuntimeTypeMapper {
+internal object RuntimeTypeMapper {
     fun mapSignature(possiblySubstitutedFunction: FunctionDescriptor): JvmFunctionSignature {
         // Fake overrides don't have a source element, so we need to take a declaration.
         // TODO: support the case when a fake override overrides several declarations with different signatures
diff --git a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/foreignKClasses.kt b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/foreignKClasses.kt
index c3aff97f77b..af346803ba0 100644
--- a/core/reflection.jvm/src/kotlin/reflect/jvm/internal/foreignKClasses.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/jvm/internal/foreignKClasses.kt
@@ -27,7 +27,7 @@ import kotlin.reflect.jvm.internal.pcollections.HashPMap
 private var FOREIGN_K_CLASSES = HashPMap.empty<String, Any>()
 
 // This function is invoked on each reflection access to Java classes, properties, etc. Performance is critical here.
-fun <T : Any> foreignKotlinClass(jClass: Class<T>): KClassImpl<T> {
+internal fun <T : Any> foreignKotlinClass(jClass: Class<T>): KClassImpl<T> {
     val name = jClass.getName()
     val cached = FOREIGN_K_CLASSES[name]
     if (cached is WeakReference<*>) {