diff --git a/compiler/serialization/src/org/jetbrains/kotlin/serialization/DescriptorSerializer.kt b/compiler/serialization/src/org/jetbrains/kotlin/serialization/DescriptorSerializer.kt
index 0bae3e96fca..295ce365156 100644
--- a/compiler/serialization/src/org/jetbrains/kotlin/serialization/DescriptorSerializer.kt
+++ b/compiler/serialization/src/org/jetbrains/kotlin/serialization/DescriptorSerializer.kt
@@ -89,7 +89,7 @@ class DescriptorSerializer private constructor(
             }
         }
 
-        if (classDescriptor.kind != ClassKind.ENUM_ENTRY) {
+        if (!DescriptorUtils.isAnonymousObject(classDescriptor) && classDescriptor.kind != ClassKind.ENUM_ENTRY) {
             for (descriptor in classDescriptor.constructors) {
                 builder.addConstructor(constructorProto(descriptor))
             }
diff --git a/compiler/testData/codegen/box/reflection/constructors/classesWithoutConstructors.kt b/compiler/testData/codegen/box/reflection/constructors/classesWithoutConstructors.kt
index a0ec6be94ff..4c9a5e84c6d 100644
--- a/compiler/testData/codegen/box/reflection/constructors/classesWithoutConstructors.kt
+++ b/compiler/testData/codegen/box/reflection/constructors/classesWithoutConstructors.kt
@@ -18,6 +18,7 @@ fun box(): String {
     assertTrue(Interface::class.constructors.isEmpty())
     assertTrue(Obj::class.constructors.isEmpty())
     assertTrue(C.Companion::class.constructors.isEmpty())
+    assertTrue(object {}::class.constructors.isEmpty())
 
     return "OK"
 }
diff --git a/compiler/testData/codegen/box/reflection/constructors/primaryConstructor.kt b/compiler/testData/codegen/box/reflection/constructors/primaryConstructor.kt
index 05da836d9b8..59f7bb06c5f 100644
--- a/compiler/testData/codegen/box/reflection/constructors/primaryConstructor.kt
+++ b/compiler/testData/codegen/box/reflection/constructors/primaryConstructor.kt
@@ -49,11 +49,13 @@ fun box(): String {
     val p4 = TwoSecondaries::class.primaryConstructor
     assertNull(p4)
 
-    assertNotNull(En::class.primaryConstructor) // TODO: maybe primaryConstructor should be null for enum classes
+    assertNotNull(En::class.primaryConstructor)
 
     assertNull(I::class.primaryConstructor)
     assertNull(O::class.primaryConstructor)
     assertNull(C.Companion::class.primaryConstructor)
 
+    assertNull(object {}::class.primaryConstructor)
+
     return "OK"
 }
diff --git a/compiler/testData/serialization/local/anonymousObject.txt b/compiler/testData/serialization/local/anonymousObject.txt
index 57a3b9a86d7..a8cd5787ca7 100644
--- a/compiler/testData/serialization/local/anonymousObject.txt
+++ b/compiler/testData/serialization/local/anonymousObject.txt
@@ -1,4 +1,3 @@
 local final class `AnonymousObjectKt$main$1` : java.lang.Runnable
 
-public constructor `AnonymousObjectKt$main$1`()
 public open override /*1*/ fun run(): kotlin.Unit
diff --git a/compiler/util/src/org/jetbrains/kotlin/utils/KotlinJavascriptMetadataUtils.kt b/compiler/util/src/org/jetbrains/kotlin/utils/KotlinJavascriptMetadataUtils.kt
index 0ad45f44f37..1852306cc5b 100644
--- a/compiler/util/src/org/jetbrains/kotlin/utils/KotlinJavascriptMetadataUtils.kt
+++ b/compiler/util/src/org/jetbrains/kotlin/utils/KotlinJavascriptMetadataUtils.kt
@@ -32,7 +32,7 @@ class JsMetadataVersion(vararg numbers: Int) : BinaryVersion(*numbers) {
 
     companion object {
         @JvmField
-        val INSTANCE = JsMetadataVersion(1, 2, 2)
+        val INSTANCE = JsMetadataVersion(1, 2, 3)
 
         @JvmField
         val INVALID_VERSION = JsMetadataVersion()
diff --git a/core/metadata.jvm/src/org/jetbrains/kotlin/metadata/jvm/deserialization/JvmMetadataVersion.kt b/core/metadata.jvm/src/org/jetbrains/kotlin/metadata/jvm/deserialization/JvmMetadataVersion.kt
index 63994c1cb7d..af2d12e09f4 100644
--- a/core/metadata.jvm/src/org/jetbrains/kotlin/metadata/jvm/deserialization/JvmMetadataVersion.kt
+++ b/core/metadata.jvm/src/org/jetbrains/kotlin/metadata/jvm/deserialization/JvmMetadataVersion.kt
@@ -18,7 +18,7 @@ class JvmMetadataVersion(vararg numbers: Int) : BinaryVersion(*numbers) {
 
     companion object {
         @JvmField
-        val INSTANCE = JvmMetadataVersion(1, 1, 10)
+        val INSTANCE = JvmMetadataVersion(1, 1, 11)
 
         @JvmField
         val INVALID_VERSION = JvmMetadataVersion()
diff --git a/core/metadata/src/org/jetbrains/kotlin/metadata/builtins/BuiltInsBinaryVersion.kt b/core/metadata/src/org/jetbrains/kotlin/metadata/builtins/BuiltInsBinaryVersion.kt
index a1e16792f66..1b546ff8000 100644
--- a/core/metadata/src/org/jetbrains/kotlin/metadata/builtins/BuiltInsBinaryVersion.kt
+++ b/core/metadata/src/org/jetbrains/kotlin/metadata/builtins/BuiltInsBinaryVersion.kt
@@ -18,7 +18,7 @@ class BuiltInsBinaryVersion(vararg numbers: Int) : BinaryVersion(*numbers) {
 
     companion object {
         @JvmField
-        val INSTANCE = BuiltInsBinaryVersion(1, 0, 3)
+        val INSTANCE = BuiltInsBinaryVersion(1, 0, 4)
 
         @JvmField
         val INVALID_VERSION = BuiltInsBinaryVersion()