diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/InterfaceImplBodyCodegen.kt b/compiler/backend/src/org/jetbrains/kotlin/codegen/InterfaceImplBodyCodegen.kt
index 3b96ea55b0f..d9624ffd991 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/InterfaceImplBodyCodegen.kt
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/InterfaceImplBodyCodegen.kt
@@ -72,21 +72,17 @@ class InterfaceImplBodyCodegen(
             // If implementation is a default interface method (JVM 8 only)
             if (implementation.isDefinitelyNotDefaultImplsMethod()) continue
 
-            // We create a copy of the function with kind = DECLARATION so that FunctionCodegen will generate its body
-            val copy = memberDescriptor.copy(memberDescriptor.containingDeclaration, Modality.OPEN, memberDescriptor.visibility,
-                                             CallableMemberDescriptor.Kind.DECLARATION, true)
-
             if (memberDescriptor is FunctionDescriptor) {
-                generateDelegationToSuperDefaultImpls(copy as FunctionDescriptor, implementation as FunctionDescriptor)
+                generateDelegationToSuperDefaultImpls(memberDescriptor, implementation as FunctionDescriptor)
             }
             else if (memberDescriptor is PropertyDescriptor) {
                 implementation as PropertyDescriptor
-                val getter = (copy as PropertyDescriptor).getter
+                val getter = memberDescriptor.getter
                 val implGetter = implementation.getter
                 if (getter != null && implGetter != null) {
                     generateDelegationToSuperDefaultImpls(getter, implGetter)
                 }
-                val setter = copy.setter
+                val setter = memberDescriptor.setter
                 val implSetter = implementation.setter
                 if (setter != null && implSetter != null) {
                     generateDelegationToSuperDefaultImpls(setter, implSetter)