diff --git a/compiler/frontend/src/org/jetbrains/kotlin/resolve/OverrideResolver.java b/compiler/frontend/src/org/jetbrains/kotlin/resolve/OverrideResolver.java
index fb15707fb0f..c1f3e4d36f9 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/resolve/OverrideResolver.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/resolve/OverrideResolver.java
@@ -841,10 +841,8 @@ public class OverrideResolver {
             @NotNull ValueParameterDescriptor parameterFromSubclass,
             @NotNull ValueParameterDescriptor parameterFromSuperclass
     ) {
-        DeclarationDescriptor subFunction = parameterFromSubclass.getContainingDeclaration();
-        DeclarationDescriptor superFunction = parameterFromSuperclass.getContainingDeclaration();
-        return subFunction instanceof CallableDescriptor && ((CallableDescriptor) subFunction).hasStableParameterNames() &&
-               superFunction instanceof CallableDescriptor && ((CallableDescriptor) superFunction).hasStableParameterNames() &&
+        return parameterFromSubclass.getContainingDeclaration().hasStableParameterNames() &&
+               parameterFromSuperclass.getContainingDeclaration().hasStableParameterNames() &&
                !parameterFromSuperclass.getName().equals(parameterFromSubclass.getName());
     }