diff --git a/src/server.c b/src/server.c
index 9de378b..1e55b08 100644
--- a/src/server.c
+++ b/src/server.c
@@ -791,6 +791,10 @@ static int server_connect(patty_ax25_server *server,
         return respond_connect(client, -1, EBADF);
     }
 
+    if (sock->type == PATTY_AX25_SOCK_RAW) {
+        return respond_connect(client, -1, ENOTSUP);
+    }
+
     switch (sock->state) {
         case PATTY_AX25_SOCK_LISTENING:
             return respond_connect(client, -1, EINVAL);