diff --git a/curses.h b/curses.h
index 0444d00e..33272f6b 100644
--- a/curses.h
+++ b/curses.h
@@ -65,24 +65,15 @@ extern "C"
 
 #undef FALSE
 #undef TRUE
-
 #ifdef __bool_true_false_are_defined
-
 # define FALSE false
 # define TRUE true
-
 #else
-
 typedef unsigned char bool;
-
 # define FALSE 0
 # define TRUE 1
-
 #endif
 
-#undef NULL
-#define NULL (void *)0
-
 #undef ERR
 #define ERR (-1)