diff --git a/glue.rs b/glue.rs
index 4c7a0c23d..275a50551 100644
--- a/glue.rs
+++ b/glue.rs
@@ -174,4 +174,5 @@ pub fn IsProxyHandlerFamily(obj: *JSObject) -> bool;
 pub fn GetProxyHandlerExtra(obj: *JSObject) -> *libc::c_void;
 pub fn GetProxyHandler(obj: *JSObject) -> *libc::c_void;
 pub fn InvokeGetOwnPropertyDescriptor(handler: *libc::c_void, cx: *JSContext, proxy: *JSObject, id: jsid, set: JSBool, desc: *mut JSPropertyDescriptor) -> JSBool;
+pub fn GetGlobalForObjectCrossCompartment(obj: *JSObject) -> *JSObject;
 }
diff --git a/jsapi.rs b/jsapi.rs
index 01cbd0117..2288435b9 100644
--- a/jsapi.rs
+++ b/jsapi.rs
@@ -256,7 +256,7 @@ pub type moz_static_assert6 = c_int;
 
 // JSVal was originally type of u64. 
 // now this become {u64} because of the union abi issue on ARM arch. See #398.
-#[deriving(Eq)]
+#[deriving(Eq,Clone)]
 pub struct JSVal {
     v: u64
 }
diff --git a/jsglue.cpp b/jsglue.cpp
index 6b31aa13a..b9d9b3bae 100644
--- a/jsglue.cpp
+++ b/jsglue.cpp
@@ -616,4 +616,10 @@ GetProxyHandler(JSObject* obj)
     return handler;
 }
 
+JSObject*
+GetGlobalForObjectCrossCompartment(JSObject* obj)
+{
+    return js::GetGlobalForObjectCrossCompartment(obj);
+}
+
 } // extern "C"