diff --git a/libraries/kotlin.test/js/it/src/test/kotlin/MainTest.kt b/libraries/kotlin.test/js/it/src/test/kotlin/MainTest.kt
index c37a9ca1913..8922204a5e5 100644
--- a/libraries/kotlin.test/js/it/src/test/kotlin/MainTest.kt
+++ b/libraries/kotlin.test/js/it/src/test/kotlin/MainTest.kt
@@ -86,9 +86,9 @@ class AsyncTest {
     }
 
     @Test
+    @Suppress("CAST_NEVER_SUCCEEDS")
     fun checkCustomPromise(): CustomPromise {
-//        return promise(10, "afterCustom") as CustomPromise
-        return promise(10, "") as CustomPromise
+        return promise(10, "afterCustom") as CustomPromise
     }
 
     @Test