--- a/dom/html/HTMLTrackElement.cpp
+++ b/dom/html/HTMLTrackElement.cpp
@@ -64,17 +64,17 @@ static constexpr nsAttrValue::EnumTable 
   { "descriptions", static_cast<int16_t>(TextTrackKind::Descriptions) },
   { "chapters", static_cast<int16_t>(TextTrackKind::Chapters) },
   { "metadata", static_cast<int16_t>(TextTrackKind::Metadata) },
   { nullptr, 0 }
 };
 
 // Invalid values are treated as "metadata" in ParseAttribute, but if no value
 // at all is specified, it's treated as "subtitles" in GetKind
-static const nsAttrValue::EnumTable* const kKindTableInvalidValueDefault = &kKindTable[4];
+static constexpr const nsAttrValue::EnumTable* kKindTableInvalidValueDefault = &kKindTable[4];
 
 class WindowDestroyObserver final : public nsIObserver
 {
   NS_DECL_ISUPPORTS
 
 public:
   explicit WindowDestroyObserver(HTMLTrackElement* aElement, uint64_t aWinID)
     : mTrackElement(aElement)