1 files changed, 1 insertions, 1 deletions
diff --git a/apps/rehash.c b/apps/rehash.c
index ad7108a..8bb9a14 100644
--- a/apps/rehash.c
+++ b/apps/rehash.c
@@ -300,7 +300,7 @@ static int massage_filename(char *name)
 
     if (q != NULL) {
         for (q++; *q != '\0'; q++) {
-            if (!isdigit(*q))
+            if (!isdigit((unsigned char)*q))
                 return 1;
         }
     }