diff --git a/content/base/public/nsContentUtils.h b/content/base/public/nsContentUtils.h
index 44d4ffab883..c4bcb068e79 100644
--- a/content/base/public/nsContentUtils.h
+++ b/content/base/public/nsContentUtils.h
@@ -1637,6 +1637,7 @@ public:
    */
   static bool CanAccessNativeAnon();
 
+  MOZ_WARN_UNUSED_RESULT
   static nsresult WrapNative(JSContext *cx, JS::Handle<JSObject*> scope,
                              nsISupports *native, const nsIID* aIID,
                              JS::MutableHandle<JS::Value> vp,
@@ -1646,12 +1647,15 @@ public:
   }
 
   // Same as the WrapNative above, but use this one if aIID is nsISupports' IID.
+  MOZ_WARN_UNUSED_RESULT
   static nsresult WrapNative(JSContext *cx, JS::Handle<JSObject*> scope,
                              nsISupports *native, JS::MutableHandle<JS::Value> vp,
                              bool aAllowWrapping = false)
   {
     return WrapNative(cx, scope, native, nullptr, nullptr, vp, aAllowWrapping);
   }
+
+  MOZ_WARN_UNUSED_RESULT
   static nsresult WrapNative(JSContext *cx, JS::Handle<JSObject*> scope,
                              nsISupports *native, nsWrapperCache *cache,
                              JS::MutableHandle<JS::Value> vp,
diff --git a/content/base/src/nsFrameMessageManager.cpp b/content/base/src/nsFrameMessageManager.cpp
index 09a08bb7cdf..d23118932a4 100644
--- a/content/base/src/nsFrameMessageManager.cpp
+++ b/content/base/src/nsFrameMessageManager.cpp
@@ -926,7 +926,8 @@ nsFrameMessageManager::ReceiveMessage(nsISupports* aTarget,
 
       JS::Rooted<JS::Value> targetv(ctx);
       JS::Rooted<JSObject*> global(ctx, JS_GetGlobalForObject(ctx, object));
-      nsContentUtils::WrapNative(ctx, global, aTarget, &targetv, true);
+      nsresult rv = nsContentUtils::WrapNative(ctx, global, aTarget, &targetv, true);
+      NS_ENSURE_SUCCESS(rv, rv);
 
       JS::Rooted<JSObject*> cpows(ctx);
       if (aCpows) {
@@ -1016,7 +1017,8 @@ nsFrameMessageManager::ReceiveMessage(nsISupports* aTarget,
           defaultThisValue = aTarget;
         }
         JS::Rooted<JSObject*> global(ctx, JS_GetGlobalForObject(ctx, object));
-        nsContentUtils::WrapNative(ctx, global, defaultThisValue, &thisValue, true);
+        nsresult rv = nsContentUtils::WrapNative(ctx, global, defaultThisValue, &thisValue, true);
+        NS_ENSURE_SUCCESS(rv, rv);
       } else {
         // If the listener is a JS object which has receiveMessage function:
         if (!JS_GetProperty(ctx, object, "receiveMessage", &funval) ||