--- a/media/mtransport/nricectx.cpp
+++ b/media/mtransport/nricectx.cpp
@@ -209,17 +209,17 @@ nsresult NrIceStunServer::ToNicerStunStr
 
   memset(server, 0, sizeof(nr_ice_stun_server));
   if (transport_ == kNrIceTransportUdp) {
     server->transport = IPPROTO_UDP;
   } else if (transport_ == kNrIceTransportTcp) {
     server->transport = IPPROTO_TCP;
   } else if (transport_ == kNrIceTransportTls) {
     server->transport = IPPROTO_TCP;
-    if (has_addr_) {
+    if (!has_addr_) {
       // Refuse to try TLS without an FQDN
       return NS_ERROR_INVALID_ARG;
     }
     server->tls = 1;
   } else {
     MOZ_MTLOG(ML_ERROR, "Unsupported STUN server transport: " << transport_);
     return NS_ERROR_FAILURE;
   }