1 files changed, 2 insertions, 1 deletions

diff --git a/src/regex.c b/src/regex.c
index fe527dd2294..2d291b323e1 100644
--- a/src/regex.c
+++ b/src/regex.c
@@ -1251,7 +1251,8 @@ typedef union
 
 
 /* Registers are set to a sentinel when they haven't yet matched.  */
-#define REG_UNSET_VALUE ((char *) -1)
+static char reg_unset_dummy;
+#define REG_UNSET_VALUE (&reg_unset_dummy)
 #define REG_UNSET(e) ((e) == REG_UNSET_VALUE)