--- a/toolkit/components/url-classifier/ProtocolParser.cpp
+++ b/toolkit/components/url-classifier/ProtocolParser.cpp
@@ -807,18 +807,18 @@ ProtocolParserProtobuf::ProcessOneRespon
 
   // Convert threat type to list name.
   nsCOMPtr<nsIUrlClassifierUtils> urlUtil =
     do_GetService(NS_URLCLASSIFIERUTILS_CONTRACTID);
   nsCString possibleListNames;
   nsresult rv = urlUtil->ConvertThreatTypeToListNames(aResponse.threat_type(),
                                                       possibleListNames);
   if (NS_FAILED(rv)) {
-    PARSER_LOG((nsPrintfCString("Threat type to list name conversion error: %d",
-                               aResponse.threat_type())).get());
+    PARSER_LOG(("Threat type to list name conversion error: %d",
+                aResponse.threat_type()));
     return NS_ERROR_FAILURE;
   }
 
   // Match the table name we received with one of the ones we requested.
   // We ignore the case where a threat type matches more than one list
   // per provider and return the first one. See bug 1287059."
   nsCString listName;
   nsTArray<nsCString> possibleListNameArray;