diff --git a/js/js.libraries/src/core/reflection.kt b/js/js.libraries/src/core/reflection.kt
index d39a65d9881..f9d3cc1cc4b 100644
--- a/js/js.libraries/src/core/reflection.kt
+++ b/js/js.libraries/src/core/reflection.kt
@@ -17,12 +17,12 @@
 package kotlin.js
 
 @native
-interface JsClass<T> {
+interface JsClass<T : Any> {
     val name: String
 }
 
 @native
-fun <T> jsClass(): JsClass<T> = noImpl
+fun <T : Any> jsClass(): JsClass<T> = noImpl
 
-val <T> T.jsClass: JsClass<T>
+val <T : Any> T.jsClass: JsClass<T>
     get() = js("Object").getPrototypeOf(this).constructor
diff --git a/js/js.translator/testData/box/reflection/light/jsClass.kt b/js/js.translator/testData/box/reflection/light/jsClass.kt
index 2a3f594a4c6..0097f0a7992 100644
--- a/js/js.translator/testData/box/reflection/light/jsClass.kt
+++ b/js/js.translator/testData/box/reflection/light/jsClass.kt
@@ -1,6 +1,6 @@
 package foo
 
-fun <T> check(x: JsClass<T>, y: JsClass<T>, shouldBeEquals: Boolean = true) {
+fun check(x: JsClass<*>, y: JsClass<*>, shouldBeEquals: Boolean = true) {
     assertNotEquals(null, x)
     assertNotEquals(null, y)
     if (shouldBeEquals)
diff --git a/js/js.translator/testData/box/reflection/light/jsClassOnReifiedType.kt b/js/js.translator/testData/box/reflection/light/jsClassOnReifiedType.kt
index d1503a4659f..a5675dc484f 100644
--- a/js/js.translator/testData/box/reflection/light/jsClassOnReifiedType.kt
+++ b/js/js.translator/testData/box/reflection/light/jsClassOnReifiedType.kt
@@ -1,6 +1,6 @@
 package foo
 
-inline fun <reified T> foo(): JsClass<T> {
+inline fun <reified T : Any> foo(): JsClass<T> {
     val T = 1
     return jsClass<T>()
 }
diff --git a/js/js.translator/testData/box/reflection/light/jsClassSimpleName.kt b/js/js.translator/testData/box/reflection/light/jsClassSimpleName.kt
index 4a9e14337d1..5facf3827ef 100644
--- a/js/js.translator/testData/box/reflection/light/jsClassSimpleName.kt
+++ b/js/js.translator/testData/box/reflection/light/jsClassSimpleName.kt
@@ -15,7 +15,7 @@ fun testWithInstance() {
     assertEquals("E", E.X.jsClass.simpleName)
     assertEquals("Y", E.Y.jsClass.simpleName)
 // TODO uncomment after KT-13338 is fixed
-//    assertEquals("E", E.Z.jsClass.name)
+//    assertEquals("E", E.Z.jsClass.simpleName)
     assertEquals("undefined", undefined().jsClass.simpleName)
     assertEquals("Nested", Outer.Nested().jsClass.simpleName)
     assertEquals("Inner", Outer().Inner().jsClass.simpleName)