diff --git a/libraries/stdlib/js-ir/src/kotlin/jsClass_js-ir.kt b/libraries/stdlib/js-ir/src/kotlin/jsClass_js-ir.kt
new file mode 100644
index 00000000000..ae2312e1f1f
--- /dev/null
+++ b/libraries/stdlib/js-ir/src/kotlin/jsClass_js-ir.kt
@@ -0,0 +1,11 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.js
+
+// DON'T USE! Use `K::class.js` instead.
+// The declaration kept only for backward compatibility with older compilers
+// TODO remove, but when?
+internal external fun <T : Any> jsClass(): JsClass<T>