diff --git a/libraries/stdlib/js-ir/runtime/typeCheckUtils.kt b/libraries/stdlib/js-ir/runtime/typeCheckUtils.kt
index fc572111ef3..c15e4aaa23d 100644
--- a/libraries/stdlib/js-ir/runtime/typeCheckUtils.kt
+++ b/libraries/stdlib/js-ir/runtime/typeCheckUtils.kt
@@ -153,15 +153,12 @@ private fun completeInterfaceCache(ctor: Ctor): IsImplementsCache? {
         }
     }
 
-    val constructor = fastGetPrototype(ctor)?.constructor ?: return null
-    val parentInterfacesCache = completeInterfaceCache(constructor) ?: return interfacesCache
+    val parentInterfacesCache = fastGetPrototype(ctor)?.constructor?.let(::completeInterfaceCache)
 
-    if (interfacesCache == null) return parentInterfacesCache
-
-    interfacesCache.extendCacheWith(parentInterfacesCache)
-    interfacesCache.isComplete = true
-
-    return interfacesCache
+    return interfacesCache?.apply {
+        extendCacheWith(parentInterfacesCache)
+        isComplete = true
+    } ?: parentInterfacesCache
 }
 
 // Old JS Backend