1 files changed, 5 insertions, 5 deletions

diff --git a/src/fontset.c b/src/fontset.c
index fc4da1305f3..6d2840ffd26 100644
--- a/src/fontset.c
+++ b/src/fontset.c
@@ -789,9 +789,9 @@ fontset_pattern_regexp (pattern)
       || strcmp (SDATA (pattern), CACHED_FONTSET_NAME))
     {
       /* We must at first update the cached data.  */
-      char *regex, *p0, *p1;
+      unsigned char *regex, *p0, *p1;
       int ndashes = 0, nstars = 0;
-      
+
       for (p0 = SDATA (pattern); *p0; p0++)
         {
           if (*p0 == '-')
@@ -804,12 +804,12 @@ fontset_pattern_regexp (pattern)
          we convert "*" to "[^-]*" which is much faster in regular
          expression matching.  */
       if (ndashes < 14)
-        p1 = regex = (char *) alloca (SBYTES (pattern) + 2 * nstars + 1);
+        p1 = regex = (unsigned char *) alloca (SBYTES (pattern) + 2 * nstars + 1);
       else
-        p1 = regex = (char *) alloca (SBYTES (pattern) + 5 * nstars + 1);
+        p1 = regex = (unsigned char *) alloca (SBYTES (pattern) + 5 * nstars + 1);
 
       *p1++ = '^';
-      for (p0 = (char *) SDATA (pattern); *p0; p0++)
+      for (p0 = SDATA (pattern); *p0; p0++)
         {
           if (*p0 == '*' && p0 > SDATA (pattern) && p0[-1] != '\\')
             {