diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/NewIrUtils.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/NewIrUtils.kt
index 27ff8f9cba4..a7c2df26a3d 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/NewIrUtils.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/NewIrUtils.kt
@@ -91,8 +91,6 @@ fun IrValueParameter.isInlineParameter(): Boolean =
 val IrDeclaration.parentDeclarationsWithSelf: Sequence<IrDeclaration>
     get() = generateSequence(this, { it.parent as? IrDeclaration })
 
-fun IrClass.companionObject() = this.declarations.filterIsInstance<IrClass>().atMostOne { it.isCompanion }
-
 fun buildSimpleAnnotation(irBuiltIns: IrBuiltIns, startOffset: Int, endOffset: Int,
                           annotationClass: IrClass, vararg args: String): IrConstructorCall {
     val constructor = annotationClass.constructors.let {
diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/KotlinObjCClassInfoGenerator.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/KotlinObjCClassInfoGenerator.kt
index 51c3662eae4..2390e0e102c 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/KotlinObjCClassInfoGenerator.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/KotlinObjCClassInfoGenerator.kt
@@ -13,10 +13,7 @@ import org.jetbrains.kotlin.backend.konan.descriptors.getAnnotationStringValue
 import org.jetbrains.kotlin.backend.konan.ir.*
 import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
-import org.jetbrains.kotlin.ir.util.constructors
-import org.jetbrains.kotlin.ir.util.findAnnotation
-import org.jetbrains.kotlin.ir.util.fqNameForIrSerialization
-import org.jetbrains.kotlin.ir.util.hasAnnotation
+import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
 
 internal class KotlinObjCClassInfoGenerator(override val context: Context) : ContextUtils {
diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt
index ca31c462b0a..3bd6993c316 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt
@@ -13,7 +13,6 @@ import org.jetbrains.kotlin.backend.konan.cgen.*
 import org.jetbrains.kotlin.backend.konan.descriptors.allOverriddenFunctions
 import org.jetbrains.kotlin.backend.konan.descriptors.synthesizedName
 import org.jetbrains.kotlin.backend.konan.ir.*
-import org.jetbrains.kotlin.backend.konan.ir.companionObject
 import org.jetbrains.kotlin.backend.konan.ir.isFinalClass
 import org.jetbrains.kotlin.backend.konan.llvm.IntrinsicType
 import org.jetbrains.kotlin.backend.konan.llvm.tryGetIntrinsicType
diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/SpecialBackendChecksTraversal.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/SpecialBackendChecksTraversal.kt
index 2930249aae8..2717916bc05 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/SpecialBackendChecksTraversal.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/SpecialBackendChecksTraversal.kt
@@ -17,7 +17,6 @@ import org.jetbrains.kotlin.backend.konan.*
 import org.jetbrains.kotlin.backend.konan.cgen.*
 import org.jetbrains.kotlin.backend.konan.descriptors.allOverriddenFunctions
 import org.jetbrains.kotlin.backend.konan.ir.*
-import org.jetbrains.kotlin.backend.konan.ir.companionObject
 import org.jetbrains.kotlin.backend.konan.ir.getSuperClassNotAny
 import org.jetbrains.kotlin.backend.konan.llvm.IntrinsicType
 import org.jetbrains.kotlin.backend.konan.llvm.tryGetIntrinsicType