diff --git a/js/js.libraries/src/core/core.kt b/js/js.libraries/src/core/core.kt
index 671cb9a5961..26d09928bdd 100644
--- a/js/js.libraries/src/core/core.kt
+++ b/js/js.libraries/src/core/core.kt
@@ -25,7 +25,8 @@ class NumberFormatException() : Exception() {}
 
 native
 fun setTimeout(callback : ()-> Unit) {}
-
+native
+fun setTimeout(callback : ()-> Unit, ms : Int) {}
 native
 fun setInterval(callback : ()-> Unit, ms : Int) {}
 native