diff --git i/js/jsstr.cpp w/js/jsstr.cpp
index e662bf1..b18597e 100644
--- i/js/jsstr.cpp
+++ w/js/jsstr.cpp
@@ -3040,7 +3040,7 @@ js_InitStringClass(JSContext *cx, JSObject *obj)
                                  JSVAL_VOID, NULL, NULL,
                                  JSPROP_READONLY | JSPROP_PERMANENT | JSPROP_SHARED, 0, 0,
                                  NULL)) {
-        return JS_FALSE;
+        return NULL;
     }
 
     return proto;
diff --git i/js/jsxml.cpp w/js/jsxml.cpp
index 5621ede..e00c97d 100644
--- i/js/jsxml.cpp
+++ w/js/jsxml.cpp
@@ -303,7 +303,7 @@ NewXMLNamespace(JSContext *cx, JSString *prefix, JSString *uri, JSBool declared)
 
     obj = js_NewObject(cx, &js_NamespaceClass.base, NULL, NULL);
     if (!obj)
-        return JS_FALSE;
+        return NULL;
     JS_ASSERT(JSVAL_IS_VOID(obj->fslots[JSSLOT_PREFIX]));
     JS_ASSERT(JSVAL_IS_VOID(obj->fslots[JSSLOT_URI]));
     JS_ASSERT(JSVAL_IS_VOID(obj->fslots[JSSLOT_DECLARED]));