1 files changed, 1 insertions, 1 deletions

diff --git a/src/regex.c b/src/regex.c
index 5a98c6c21aa..3581b38dbd3 100644
--- a/src/regex.c
+++ b/src/regex.c
@@ -183,7 +183,7 @@ init_syntax_once ()
 #define ISXDIGIT(c) (ISASCII (c) && isxdigit (c))
 
 #ifndef NULL
-#define NULL 0
+#define NULL (void *)0
 #endif
 
 /* We remove any previous definition of `SIGN_EXTEND_CHAR',