diff --git a/src/include/lwip/debug.h b/src/include/lwip/debug.h
index 73482aad..94ddf8a6 100644
--- a/src/include/lwip/debug.h
+++ b/src/include/lwip/debug.h
@@ -46,7 +46,7 @@
 #define DEMO_DEBUG       0
 #endif
 
-#ifndef ETHARP_DEGUG
+#ifndef ETHARP_DEBUG
 #define ETHARP_DEBUG     0
 #endif