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-rw-r--r--src/dosinst.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/dosinst.c b/src/dosinst.c
index 4eae5aadc4..35625a7946 100644
--- a/src/dosinst.c
+++ b/src/dosinst.c
@@ -2760,7 +2760,7 @@ main(int argc, char **argv)
rewind(stdin);
if (scanf("%99s", buf) == 1)
{
- if (isdigit(buf[0]))
+ if (isdigit((unsigned char)buf[0]))
{
// Change a choice.
i = atoi(buf);