diff --git a/dom/base/Element.cpp b/dom/base/Element.cpp
index f787e4d21f..0054f48006 100644
--- a/dom/base/Element.cpp
+++ b/dom/base/Element.cpp
@@ -1316,7 +1316,7 @@ Element::SetAttribute(const nsAString& aName,
   nsAutoString nameToUse;
   const nsAttrName* name = InternalGetAttrNameFromQName(aName, &nameToUse);
   if (!name) {
-    nsCOMPtr<nsIAtom> nameAtom = NS_Atomize(nameToUse);
+    nsCOMPtr<nsIAtom> nameAtom = NS_AtomizeMainThread(nameToUse);
     if (!nameAtom) {
       aError.Throw(NS_ERROR_OUT_OF_MEMORY);
       return;