diff --git a/c_src/procket_cmd.c b/c_src/procket_cmd.c
index 5556370..ac07f74 100644
--- a/c_src/procket_cmd.c
+++ b/c_src/procket_cmd.c
@@ -228,7 +228,7 @@ procket_lookup_socket(PROCKET_STATE *ps)
     hints.ai_family = ps->family;
     hints.ai_socktype = ps->type;
     hints.ai_protocol = ps->protocol;
-    hints.ai_flags = AI_NUMERICHOST | AI_PASSIVE;
+    hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV | AI_PASSIVE;
 
     err = getaddrinfo(ps->address, ps->port, &hints, &res);