(NULL): Use explicit cast.

diff --git a/src/regex.c b/src/regex.c
index 5a98c6c21aa118201fff9200b76b3f2c7a795d31..3581b38dbd31c25290561428887469e83a63b8ca 100644 (file)
--- 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',