diff --git a/apps/ping/ping.c b/apps/ping/ping.c
index 20f16b0..c13c289 100644
--- a/apps/ping/ping.c
+++ b/apps/ping/ping.c
@@ -284,6 +284,7 @@ ping_send(struct raw_pcb *raw, ip_addr_t *addr)
   pbuf_free(p);
 }
 
+#if LWIP_TIMERS
 static void
 ping_timeout(void *arg)
 {
@@ -296,6 +297,7 @@ ping_timeout(void *arg)
 
   sys_timeout(PING_DELAY, ping_timeout, pcb);
 }
+#endif
 
 static void
 ping_raw_init(void)
@@ -305,7 +307,9 @@ ping_raw_init(void)
 
   raw_recv(ping_pcb, ping_recv, NULL);
   raw_bind(ping_pcb, IP_ADDR_ANY);
+#if LWIP_TIMERS
   sys_timeout(PING_DELAY, ping_timeout, ping_pcb);
+#endif
 }
 
 void