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-rw-r--r--libpam/pam_start.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libpam/pam_start.c b/libpam/pam_start.c
index 1fc36b3e..5e9b0948 100644
--- a/libpam/pam_start.c
+++ b/libpam/pam_start.c
@@ -67,7 +67,7 @@ static int _pam_start_internal (
char *tmp;
for (tmp=(*pamh)->service_name; *tmp; ++tmp)
- *tmp = tolower(*tmp); /* require lower case */
+ *tmp = tolower((unsigned char)*tmp); /* require lower case */
}
if (user) {