diff --git a/lib/defines.h b/lib/defines.h
index 311bd7c4..1cfc537b 100644
--- a/lib/defines.h
+++ b/lib/defines.h
@@ -243,10 +243,6 @@ static inline void memzero(void *ptr, size_t size)
 #endif
 #endif
 
-#ifndef NULL
-#define NULL ((void *) 0)
-#endif
-
 #ifdef sun			/* hacks for compiling on SunOS */
 # ifndef SOLARIS
 extern char *strdup ();