X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/4e6d40912e43afdde39744815e30dd425a4849d3..e93ed4323c03b94653cda6ba5881c0081c3d905f:/rlogin.c

diff --git a/rlogin.c b/rlogin.c
index 89a2bfe1..7b13a789 100644
--- a/rlogin.c
+++ b/rlogin.c
@@ -169,7 +169,7 @@ static char *rlogin_init(void *frontend_handle, void **backend_handle,
 	sk_write(rlogin->s, cfg->termtype,
 		 strlen(cfg->termtype));
 	sk_write(rlogin->s, "/", 1);
-	for (p = cfg->termspeed; isdigit(*p); p++) continue;
+	for (p = cfg->termspeed; isdigit((unsigned char)*p); p++) continue;
 	sk_write(rlogin->s, cfg->termspeed, p - cfg->termspeed);
 	rlogin->bufsize = sk_write(rlogin->s, &z, 1);
     }