1 files changed, 3 insertions, 2 deletions
diff --git a/dom/events/DOMEventTargetHelper.cpp b/dom/events/DOMEventTargetHelper.cpp
index ef5b29fa5c..458d85215f 100644
--- a/dom/events/DOMEventTargetHelper.cpp
+++ b/dom/events/DOMEventTargetHelper.cpp
@@ -52,11 +52,12 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMEventTargetHelper)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(DOMEventTargetHelper)
-  if (tmp->IsBlack() || tmp->IsCertainlyAliveForCC()) {
+  bool isBlack = tmp->IsBlack();
+  if (isBlack || tmp->IsCertainlyAliveForCC()) {
     if (tmp->mListenerManager) {
       tmp->mListenerManager->MarkForCC();
     }
-    if (!tmp->IsBlack() && tmp->PreservingWrapper()) {
+    if (!isBlack && tmp->PreservingWrapper()) {
       // This marks the wrapper black.
       tmp->GetWrapper();
     }