diff --git a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt
index fb783f6307a..6929977880b 100644
--- a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt
+++ b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt
@@ -151,12 +151,12 @@ class Fir2IrDeclarationStorage(
     }
 
     private fun IrClass.declareSupertypesAndTypeParameters(klass: FirClass<*>): IrClass {
-        superTypes = klass.superTypeRefs.map { superTypeRef ->
-            superTypeRef.toIrType(session, this@Fir2IrDeclarationStorage)
-        }
         if (klass is FirRegularClass) {
             setTypeParameters(klass)
         }
+        superTypes = klass.superTypeRefs.map { superTypeRef ->
+            superTypeRef.toIrType(session, this@Fir2IrDeclarationStorage)
+        }
         return this
     }