diff --git a/net/socket.c b/net/socket.c
index 6664a75aa4..95060e5ca2 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -674,8 +674,8 @@ int net_init_socket(const Netdev *netdev, const char *name,
     assert(netdev->type == NET_CLIENT_DRIVER_SOCKET);
     sock = &netdev->u.socket;
 
-    if (sock->has_listen + sock->has_connect + sock->has_mcast +
-        sock->has_udp > 1) {
+    if (sock->has_fd + sock->has_listen + sock->has_connect + sock->has_mcast +
+        sock->has_udp != 1) {
         error_report("exactly one of listen=, connect=, mcast= or udp="
                      " is required");
         return -1;