diff --git a/dom/canvas/CanvasUtils.cpp b/dom/canvas/CanvasUtils.cpp
index dd9271ee59a2..9f9b65bc82f9 100644
--- a/dom/canvas/CanvasUtils.cpp
+++ b/dom/canvas/CanvasUtils.cpp
@@ -306,7 +306,7 @@ bool CheckWriteOnlySecurity(bool aCORSUsed, nsIPrincipal* aPrincipal,
     }
 
     nsIGlobalObject* incumbentSettingsObject = dom::GetIncumbentGlobal();
-    if (NS_WARN_IF(!incumbentSettingsObject)) {
+    if (!incumbentSettingsObject) {
       return true;
     }