diff --git a/coreapi/sal.c b/coreapi/sal.c
index 1af6d000b..92b82d52c 100644
--- a/coreapi/sal.c
+++ b/coreapi/sal.c
@@ -32,6 +32,7 @@ const char* sal_transport_to_string(SalTransport transport) {
         case SalTransportDTLS:return "DTLS";
         default: {
             ms_fatal("Unexpected transport [%i]",transport);
+            return NULL;
         }
             
     }