diff --git a/idea/idea-core/src/org/jetbrains/kotlin/idea/core/overrideImplement/OverrideMemberChooserObject.kt b/idea/idea-core/src/org/jetbrains/kotlin/idea/core/overrideImplement/OverrideMemberChooserObject.kt
index 1c1900b952c..3b1167e0966 100644
--- a/idea/idea-core/src/org/jetbrains/kotlin/idea/core/overrideImplement/OverrideMemberChooserObject.kt
+++ b/idea/idea-core/src/org/jetbrains/kotlin/idea/core/overrideImplement/OverrideMemberChooserObject.kt
@@ -235,7 +235,7 @@ private val EXPECT_RENDERER = OVERRIDE_RENDERER.withOptions {
 }
 
 private val ACTUAL_RENDERER = EXPECT_RENDERER.withOptions {
-    modifiers += ACTUAL
+    modifiers = modifiers + ACTUAL
     actualPropertiesInPrimaryConstructor = true
     renderTypeExpansions = false
     renderConstructorDelegation = true