diff --git a/core/descriptors/src/org/jetbrains/kotlin/types/checker/NewKotlinTypeChecker.kt b/core/descriptors/src/org/jetbrains/kotlin/types/checker/NewKotlinTypeChecker.kt
index 91309cf06e8..85bd277353a 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/types/checker/NewKotlinTypeChecker.kt
+++ b/core/descriptors/src/org/jetbrains/kotlin/types/checker/NewKotlinTypeChecker.kt
@@ -243,7 +243,7 @@ object NewKotlinTypeChecker : KotlinTypeChecker {
         }
 
         // i.e. superType is not a classType
-        if (constructor !is ClassDescriptor) {
+        if (constructor.declarationDescriptor !is ClassDescriptor) {
             return collectAllSupertypesWithGivenTypeConstructor(baseType, constructor)
         }