diff --git a/compiler/testData/asJava/lightClasses/nullabilityAnnotations/JvmOverloads.kt b/compiler/testData/asJava/lightClasses/nullabilityAnnotations/JvmOverloads.kt
index f74f173c583..41047055587 100644
--- a/compiler/testData/asJava/lightClasses/nullabilityAnnotations/JvmOverloads.kt
+++ b/compiler/testData/asJava/lightClasses/nullabilityAnnotations/JvmOverloads.kt
@@ -6,3 +6,5 @@ class C {
         return "a"
     }
 }
+
+// FIR_COMPARISON
\ No newline at end of file
diff --git a/compiler/testData/asJava/lightClasses/nullabilityAnnotations/Trait.kt b/compiler/testData/asJava/lightClasses/nullabilityAnnotations/Trait.kt
index b9d1c860a91..43561766384 100644
--- a/compiler/testData/asJava/lightClasses/nullabilityAnnotations/Trait.kt
+++ b/compiler/testData/asJava/lightClasses/nullabilityAnnotations/Trait.kt
@@ -17,4 +17,6 @@ interface Trait {
     var nullableVar: String?
     val notNullVal: String
     var notNullVar: String
-}
\ No newline at end of file
+}
+
+// FIR_COMPARISON
\ No newline at end of file
diff --git a/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/asJava/classes/firLightClassUtils.kt b/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/asJava/classes/firLightClassUtils.kt
index 469a4f04c2c..6d1820eaa56 100644
--- a/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/asJava/classes/firLightClassUtils.kt
+++ b/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/asJava/classes/firLightClassUtils.kt
@@ -133,7 +133,7 @@ internal fun FirLightClassBase.createMethods(
                                 containingClass = this@createMethods,
                                 isTopLevel = isTopLevel,
                                 methodIndex = methodIndex++,
-                                argumentsSkipMask = skipMask
+                                argumentsSkipMask = skipMask.clone() as BitSet
                             )
                         )
                     }