diff --git a/netwerk/protocol/http/nsCORSListenerProxy.cpp b/netwerk/protocol/http/nsCORSListenerProxy.cpp
index 7f0c06d04f..fdb6bb97e5 100644
--- a/netwerk/protocol/http/nsCORSListenerProxy.cpp
+++ b/netwerk/protocol/http/nsCORSListenerProxy.cpp
@@ -249,7 +249,7 @@ nsPreflightCache::CacheEntry::CheckRequest(const nsCString& aMethod,
     }
   }
 
-  const struct CheckHeaderToken {
+  struct CheckHeaderToken {
     bool Equals(const TokenTime& e, const nsCString& header) const {
       return e.token.Equals(header, comparator);
     }