diff --git a/mozilla/js/rhino/src/org/mozilla/javascript/NativeJavaObject.java b/mozilla/js/rhino/src/org/mozilla/javascript/NativeJavaObject.java
index 847c9d3c49e..ee76af867cb 100644
--- a/mozilla/js/rhino/src/org/mozilla/javascript/NativeJavaObject.java
+++ b/mozilla/js/rhino/src/org/mozilla/javascript/NativeJavaObject.java
@@ -370,7 +370,7 @@ WrapFactory#wrap(Context, Scriptable, Object, Class)}
 
         case JSTYPE_OBJECT:
             // Other objects takes #1-#3 spots
-            if (to == fromObj.getClass()) {
+            if (to.isInstance(fromObj)) {
                 // No conversion required
                 return 1;
             }