diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirSupertypesResolution.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirSupertypesResolution.kt
index 7a10ae85036..a583654d320 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirSupertypesResolution.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirSupertypesResolution.kt
@@ -282,7 +282,7 @@ private class FirSupertypeResolverVisitor(
         supertypeRefs: List<FirTypeRef>
     ): List<FirTypeRef> {
         return resolveSpecificClassLikeSupertypes(classLikeDeclaration) { transformer, scope ->
-            supertypeRefs.mapTo(mutableListOf()) {
+            ArrayList(supertypeRefs).mapTo(mutableListOf()) {
                 val superTypeRef = transformer.transformTypeRef(it, scope).single
 
                 if (superTypeRef.coneTypeSafe<ConeTypeParameterType>() != null)