diff --git a/src/include/lwip/timers.h b/src/include/lwip/timers.h
index 5dc0d0db..e41ffa38 100644
--- a/src/include/lwip/timers.h
+++ b/src/include/lwip/timers.h
@@ -43,7 +43,10 @@ extern "C" {
 #endif
 
 #ifndef LWIP_DEBUG_TIMERNAMES
-#define LWIP_DEBUG_TIMERNAMES (LWIP_DEBUG && SYS_DEBUG)
+#ifdef LWIP_DEBUG
+#define LWIP_DEBUG_TIMERNAMES SYS_DEBUG
+#else
+#define LWIP_DEBUG_TIMERNAMES 0
 #endif
 
 typedef void (* sys_timeout_handler)(void *arg);