diff --git a/src/vnet/session/transport.c b/src/vnet/session/transport.c
index 902c7400af9..1f4772b80cf 100644
--- a/src/vnet/session/transport.c
+++ b/src/vnet/session/transport.c
@@ -174,7 +174,7 @@ unformat_transport_proto (unformat_input_t * input, va_list * args)
 #undef _
     if (longest_match)
     {
-      unformat (input, str_match);
+      (void) unformat (input, str_match);
       return 1;
     }