1 files changed, 1 insertions, 1 deletions
diff --git a/xpcom/reflect/xptcall/xptcall.h b/xpcom/reflect/xptcall/xptcall.h
index 1f2367b5d..304787635 100644
--- a/xpcom/reflect/xptcall/xptcall.h
+++ b/xpcom/reflect/xptcall/xptcall.h
@@ -39,7 +39,7 @@ struct nsXPTCMiniVariant
         // Types below here are unknown to the assembly implementations, and
         // therefore _must_ be passed with indirect semantics. We put them in
         // the union here for type safety, so that we can avoid void* tricks.
-        JS::Value j;
+        JS::UninitializedValue j;
     } val;
 };