1 files changed, 1 insertions, 1 deletions

diff --git a/src/regex.c b/src/regex.c
index 2421f5a884f..29928e9dfc2 100644
--- a/src/regex.c
+++ b/src/regex.c
@@ -4555,7 +4555,7 @@ re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop)
             else
 #endif /* not emacs */
               {
-                buf_ch = *d;
+                buf_ch = (unsigned char) *d;
                 buf_charlen = 1;
               }