X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/puzzles/blobdiff_plain/4d08de49555f22d1fcf2d9977a19591a0f465b2d..aafaa7fbd122f8109c1a7d99faf74d4892bf22de:/sixteen.c?ds=sidebyside

diff --git a/sixteen.c b/sixteen.c
index 0e4f8a8..457e9c9 100644
--- a/sixteen.c
+++ b/sixteen.c
@@ -100,7 +100,7 @@ static void decode_params(game_params *ret, char const *string)
 {
     ret->w = ret->h = atoi(string);
     ret->movetarget = 0;
-    while (*string && isdigit(*string)) string++;
+    while (*string && isdigit((unsigned char)*string)) string++;
     if (*string == 'x') {
         string++;
         ret->h = atoi(string);