diff --git a/src/server/tabletennis.c b/src/server/tabletennis.c
--- a/src/server/tabletennis.c
+++ b/src/server/tabletennis.c
@@ -83,7 +83,6 @@ int tabletennis_serve(tabletennis_t tabl
 
   struct distren_request *req;
   void *req_data;
-  size_t req_len;
 
   clock_gettime(CLOCK_MONOTONIC, &time_now);
 
@@ -95,7 +94,7 @@ int tabletennis_serve(tabletennis_t tabl
       q_dequeue(tabletennis->clients_to_ping);
 
       /* use time_next_check as the ping data */
-      req_len = distren_request_poing(&req, &req_data, 1, &time_next_check, sizeof(time_next_check));
+      distren_request_poing(&req, &req_data, 1, &time_next_check, sizeof(time_next_check));
       distrend_client_write_request(client, req, req_data);
       distren_request_free_with_data(req, req_data);