diff --git a/js/js.libraries/src/core/core.kt b/js/js.libraries/src/core/core.kt
index f093639a347..8042deab886 100644
--- a/js/js.libraries/src/core/core.kt
+++ b/js/js.libraries/src/core/core.kt
@@ -1,5 +1,6 @@
 package kotlin.js
 
+@Deprecated(message = "Use `definedExternally` instead", level = DeprecationLevel.ERROR, replaceWith = ReplaceWith("definedExternally"))
 public external val noImpl: Nothing
 
 public external val definedExternally: Nothing