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[sgt/puzzles] / samegame.c

diff --git a/samegame.c b/samegame.c
index 810a8eb..4bb535d 100644 (file)
--- a/samegame.c
+++ b/samegame.c
@@ -291,9 +291,9 @@ static char *validate_desc(game_params *params, char *desc)
        char *q = p;
        int n;
 
-       if (!isdigit(*p))
+       if (!isdigit((unsigned char)*p))
            return "Not enough numbers in string";
-       while (isdigit(*p)) p++;
+       while (isdigit((unsigned char)*p)) p++;
 
        if (i < area-1 && *p != ',')
            return "Expected comma after number";