diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/WrappedDescriptors.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/WrappedDescriptors.kt
index cac10c5da33..d9bce58713f 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/WrappedDescriptors.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/WrappedDescriptors.kt
@@ -595,7 +595,7 @@ open class WrappedClassDescriptor(
 
     override fun isInline() = owner.isInline
 
-    override fun isFun() = TODO("not implemented")
+    override fun isFun() = owner.isFun
 
     override fun getThisAsReceiverParameter() = owner.thisReceiver?.descriptor as ReceiverParameterDescriptor