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-rw-r--r--js/src/jsobj.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/js/src/jsobj.cpp b/js/src/jsobj.cpp
index 5f6331ac8..bea01daf4 100644
--- a/js/src/jsobj.cpp
+++ b/js/src/jsobj.cpp
@@ -471,7 +471,7 @@ js::SetIntegrityLevel(JSContext* cx, HandleObject obj, IntegrityLevel level)
// Steps 8-9, loosely interpreted.
if (obj->isNative() && !obj->as<NativeObject>().inDictionaryMode() &&
- !obj->is<TypedArrayObject>())
+ !obj->is<TypedArrayObject>() && !obj->is<MappedArgumentsObject>())
{
HandleNativeObject nobj = obj.as<NativeObject>();