diff --git a/src/include/lwip/debug.h b/src/include/lwip/debug.h
index d5c4e474..d8359ea3 100644
--- a/src/include/lwip/debug.h
+++ b/src/include/lwip/debug.h
@@ -35,12 +35,13 @@
 #include "lwip/arch.h"
 
 /** lower two bits indicate debug level
- * - 0 off
+ * - 0 all
  * - 1 warning
  * - 2 serious
  * - 3 severe
  */
-#define LWIP_DBG_LEVEL_OFF     0x00
+#define LWIP_DBG_LEVEL_ALL     0x00
+#define LWIP_DBG_LEVEL_OFF     LWIP_DBG_LEVEL_ALL /* compatibility define only */
 #define LWIP_DBG_LEVEL_WARNING 0x01 /* bad checksums, dropped packets, ... */
 #define LWIP_DBG_LEVEL_SERIOUS 0x02 /* memory allocation failures, ... */
 #define LWIP_DBG_LEVEL_SEVERE  0x03
diff --git a/src/include/lwip/opt.h b/src/include/lwip/opt.h
index 1f3f9bcd..bc954d2e 100644
--- a/src/include/lwip/opt.h
+++ b/src/include/lwip/opt.h
@@ -1591,7 +1591,7 @@
  * messages are written.
  */
 #ifndef LWIP_DBG_MIN_LEVEL
-#define LWIP_DBG_MIN_LEVEL              LWIP_DBG_LEVEL_OFF
+#define LWIP_DBG_MIN_LEVEL              LWIP_DBG_LEVEL_ALL
 #endif
 
 /**