diff --git a/lib/ipv4.h b/lib/ipv4.h
index 81fa046b..c37ea803 100644
--- a/lib/ipv4.h
+++ b/lib/ipv4.h
@@ -13,7 +13,7 @@
 
 #include "lib/bitops.h"
 
-#ifdef DEBUG
+#ifdef DEBUGGING
 
 /*
  *	Use the structural representation when you want to make sure
diff --git a/nest/rt-fib.c b/nest/rt-fib.c
index 1522906e..3840712b 100644
--- a/nest/rt-fib.c
+++ b/nest/rt-fib.c
@@ -105,7 +105,7 @@ fib_get(struct fib *f, ip_addr *a, int len)
     e = e->next;
   if (e)
     return e;
-#ifdef DEBUG
+#ifdef DEBUGGING
   if (len < 0 || len > BITS_PER_IP_ADDRESS || !ip_is_prefix(*a,len))
     die("fib_get() called for invalid address");
 #endif
diff --git a/sysdep/config.h b/sysdep/config.h
index 27b9da36..90ab8bbc 100644
--- a/sysdep/config.h
+++ b/sysdep/config.h
@@ -13,7 +13,7 @@
 
 /* Include debugging code */
 
-#define DEBUG
+#define DEBUGGING
 
 /* Types */