diff --git a/compiler/frontend/src/org/jetbrains/kotlin/resolve/extensions/SyntheticResolveExtension.kt b/compiler/frontend/src/org/jetbrains/kotlin/resolve/extensions/SyntheticResolveExtension.kt
index 921ea5cee20..30c7a96f4d8 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/resolve/extensions/SyntheticResolveExtension.kt
+++ b/compiler/frontend/src/org/jetbrains/kotlin/resolve/extensions/SyntheticResolveExtension.kt
@@ -149,6 +149,7 @@ interface SyntheticResolveExtension {
      * or null in case it needs to run resolution and inference and/or it is very costly.
      * Override this method if resolution started to fail with recursion.
      */
+    @JvmDefault
     fun getPossibleSyntheticNestedClassNames(thisDescriptor: ClassDescriptor): List<Name>? = getSyntheticNestedClassNames(thisDescriptor)
 
     fun addSyntheticSupertypes(thisDescriptor: ClassDescriptor, supertypes: MutableList<KotlinType>) {}