diff --git a/mozilla/js/src/xpconnect/src/xpcconvert.cpp b/mozilla/js/src/xpconnect/src/xpcconvert.cpp
index 4e91a888dfb..8081356778b 100644
--- a/mozilla/js/src/xpconnect/src/xpcconvert.cpp
+++ b/mozilla/js/src/xpconnect/src/xpcconvert.cpp
@@ -1558,6 +1558,7 @@ XPCConvert::NativeArray2JS(XPCCallContext& ccx,
 
     // root this early
     *d = OBJECT_TO_JSVAL(array);
+    AUTO_MARK_JSVAL(ccx, d);
 
     if(pErr)
         *pErr = NS_ERROR_XPC_BAD_CONVERT_NATIVE;