diff --git a/js/rhino/src/org/mozilla/javascript/NativeObject.java b/js/rhino/src/org/mozilla/javascript/NativeObject.java
index 796bae339d66..9f44f73ec7f7 100644
--- a/js/rhino/src/org/mozilla/javascript/NativeObject.java
+++ b/js/rhino/src/org/mozilla/javascript/NativeObject.java
@@ -92,7 +92,9 @@ final class NativeObjectPrototype extends NativeObject
             case Id_toLocaleString: // For now just alias toString
             case Id_toString: {
                 if (cx.hasFeature(Context.FEATURE_TO_STRING_AS_SOURCE)) {
-                    String s = toSource(cx, scope, thisObj, args);
+                    String s = ScriptRuntime.defaultObjectToSource(cx, scope,
+                                                                   thisObj,
+                                                                   args);
                     int L = s.length();
                     if (L != 0 && s.charAt(0) == '(' && s.charAt(L - 1) == ')')
                     {
@@ -145,75 +147,12 @@ final class NativeObjectPrototype extends NativeObject
             }
 
             case Id_toSource:
-                return toSource(cx, scope, thisObj, args);
+                return ScriptRuntime.defaultObjectToSource(cx, scope, thisObj,
+                                                           args);
         }
         return super.execMethod(f, cx, scope, thisObj, args);
     }
 
-    private static String toSource(Context cx, Scriptable scope,
-                                   Scriptable thisObj, Object[] args)
-        throws JavaScriptException
-    {
-        boolean toplevel, iterating;
-        if (cx.iterating == null) {
-            toplevel = true;
-            iterating = false;
-            cx.iterating = new ObjToIntMap(31);
-        } else {
-            toplevel = false;
-            iterating = cx.iterating.has(thisObj);
-        }
-
-        StringBuffer result = new StringBuffer(128);
-        if (toplevel) {
-            result.append("(");
-        }
-        result.append('{');
-
-        // Make sure cx.iterating is set to null when done
-        // so we don't leak memory
-        try {
-            if (!iterating) {
-                cx.iterating.intern(thisObj); // stop recursion.
-                Object[] ids = thisObj.getIds();
-                for(int i=0; i < ids.length; i++) {
-                    if (i > 0)
-                        result.append(", ");
-                    Object id = ids[i];
-                    Object value;
-                    if (id instanceof Integer) {
-                        int intId = ((Integer)id).intValue();
-                        value = thisObj.get(intId, thisObj);
-                        result.append(intId);
-                    } else {
-                        String strId = (String)id;
-                        value = thisObj.get(strId, thisObj);
-                        if (ScriptRuntime.isValidIdentifierName(strId)) {
-                            result.append(strId);
-                        } else {
-                            result.append('\'');
-                            result.append(
-                                ScriptRuntime.escapeString(strId, '\''));
-                            result.append('\'');
-                        }
-                    }
-                    result.append(':');
-                    result.append(ScriptRuntime.uneval(cx, scope, value));
-                }
-            }
-        } finally {
-            if (toplevel) {
-                cx.iterating = null;
-            }
-        }
-
-        result.append('}');
-        if (toplevel) {
-            result.append(')');
-        }
-        return result.toString();
-    }
-
     protected String getIdName(int id)
     {
         switch (id) {
diff --git a/js/rhino/src/org/mozilla/javascript/ScriptRuntime.java b/js/rhino/src/org/mozilla/javascript/ScriptRuntime.java
index 19fff5755ed3..88571346ba6e 100644
--- a/js/rhino/src/org/mozilla/javascript/ScriptRuntime.java
+++ b/js/rhino/src/org/mozilla/javascript/ScriptRuntime.java
@@ -624,6 +624,69 @@ public class ScriptRuntime {
         throw Kit.badTypeJS(value);
     }
 
+    static String defaultObjectToSource(Context cx, Scriptable scope,
+                                        Scriptable thisObj, Object[] args)
+    {
+        boolean toplevel, iterating;
+        if (cx.iterating == null) {
+            toplevel = true;
+            iterating = false;
+            cx.iterating = new ObjToIntMap(31);
+        } else {
+            toplevel = false;
+            iterating = cx.iterating.has(thisObj);
+        }
+
+        StringBuffer result = new StringBuffer(128);
+        if (toplevel) {
+            result.append("(");
+        }
+        result.append('{');
+
+        // Make sure cx.iterating is set to null when done
+        // so we don't leak memory
+        try {
+            if (!iterating) {
+                cx.iterating.intern(thisObj); // stop recursion.
+                Object[] ids = thisObj.getIds();
+                for(int i=0; i < ids.length; i++) {
+                    if (i > 0)
+                        result.append(", ");
+                    Object id = ids[i];
+                    Object value;
+                    if (id instanceof Integer) {
+                        int intId = ((Integer)id).intValue();
+                        value = thisObj.get(intId, thisObj);
+                        result.append(intId);
+                    } else {
+                        String strId = (String)id;
+                        value = thisObj.get(strId, thisObj);
+                        if (ScriptRuntime.isValidIdentifierName(strId)) {
+                            result.append(strId);
+                        } else {
+                            result.append('\'');
+                            result.append(
+                                ScriptRuntime.escapeString(strId, '\''));
+                            result.append('\'');
+                        }
+                    }
+                    result.append(':');
+                    result.append(ScriptRuntime.uneval(cx, scope, value));
+                }
+            }
+        } finally {
+            if (toplevel) {
+                cx.iterating = null;
+            }
+        }
+
+        result.append('}');
+        if (toplevel) {
+            result.append(')');
+        }
+        return result.toString();
+    }
+
     public static Scriptable toObject(Scriptable scope, Object val)
     {
         if (val instanceof Scriptable && val != Undefined.instance) {