diff --git a/js/src/jsxml.c b/js/src/jsxml.c
index 3939963cd76..025718abd9d 100644
--- a/js/src/jsxml.c
+++ b/js/src/jsxml.c
@@ -446,8 +446,7 @@ qname_equality(JSContext *cx, JSObject *obj, jsval v, JSBool *bp)
 JS_FRIEND_DATA(JSExtendedClass) js_QNameClass = {
   { "QName",
     JSCLASS_HAS_PRIVATE | JSCLASS_CONSTRUCT_PROTOTYPE | JSCLASS_IS_EXTENDED |
-    JSCLASS_MARK_IS_TRACE | JSCLASS_HAS_CACHED_PROTO(JSProto_QName) |
-    JSCLASS_FIXED_BINDING,
+    JSCLASS_MARK_IS_TRACE | JSCLASS_HAS_CACHED_PROTO(JSProto_QName),
     JS_PropertyStub,   JS_PropertyStub,   qname_getProperty, NULL,
     JS_EnumerateStub,  JS_ResolveStub,    JS_ConvertStub,    qname_finalize,
     NULL,              NULL,              NULL,              NULL,
@@ -5561,7 +5560,7 @@ xml_getObjectOps(JSContext *cx, JSClass *clasp)
 JS_FRIEND_DATA(JSClass) js_XMLClass = {
     js_XML_str,
     JSCLASS_HAS_PRIVATE | JSCLASS_MARK_IS_TRACE |
-    JSCLASS_HAS_CACHED_PROTO(JSProto_XML) | JSCLASS_FIXED_BINDING,
+    JSCLASS_HAS_CACHED_PROTO(JSProto_XML),
     JS_PropertyStub,   JS_PropertyStub,   JS_PropertyStub,   JS_PropertyStub,
     JS_EnumerateStub,  JS_ResolveStub,    JS_ConvertStub,    xml_finalize,
     xml_getObjectOps,  NULL,              NULL,              NULL,
@@ -7678,8 +7677,7 @@ js_InitXMLClass(JSContext *cx, JSObject *obj)
         return NULL;
 
     /* Define the XMLList function and give it the same prototype as XML. */
-    fun = JS_DefineFunction(cx, obj, js_XMLList_str, XMLList, 1,
-                            JSPROP_READONLY | JSPROP_PERMANENT);
+    fun = JS_DefineFunction(cx, obj, js_XMLList_str, XMLList, 1, 0);
     if (!fun)
         return NULL;
     if (!js_SetClassPrototype(cx, fun->object, proto,