--- a/netwerk/dns/nsDNSService2.cpp
+++ b/netwerk/dns/nsDNSService2.cpp
@@ -671,18 +671,19 @@ nsDNSService::AsyncResolve(const nsACStr
     if (!res)
         return NS_ERROR_OFFLINE;
 
     if (mOffline)
         flags |= RESOLVE_OFFLINE;
 
     const nsACString *hostPtr = &hostname;
 
+    nsAutoCString strLocalhost(NS_LITERAL_CSTRING("localhost"));
     if (localDomain) {
-        hostPtr = &(NS_LITERAL_CSTRING("localhost"));
+        hostPtr = &strLocalhost;
     }
 
     nsresult rv;
     nsAutoCString hostACE;
     if (idn && !IsASCII(*hostPtr)) {
         if (NS_SUCCEEDED(idn->ConvertUTF8toACE(*hostPtr, hostACE)))
             hostPtr = &hostACE;
     }
@@ -780,18 +781,19 @@ nsDNSService::Resolve(const nsACString &
 
     NS_ENSURE_TRUE(res, NS_ERROR_OFFLINE);
 
     if (mOffline)
         flags |= RESOLVE_OFFLINE;
 
     const nsACString *hostPtr = &hostname;
 
+    nsAutoCString strLocalhost(NS_LITERAL_CSTRING("localhost"));
     if (localDomain) {
-        hostPtr = &(NS_LITERAL_CSTRING("localhost"));
+        hostPtr = &strLocalhost;
     }
 
     nsresult rv;
     nsAutoCString hostACE;
     if (idn && !IsASCII(*hostPtr)) {
         if (NS_SUCCEEDED(idn->ConvertUTF8toACE(*hostPtr, hostACE)))
             hostPtr = &hostACE;
     }