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-rw-r--r--libpamc/pamc_load.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libpamc/pamc_load.c b/libpamc/pamc_load.c
index b4fa78b3..69fb8b87 100644
--- a/libpamc/pamc_load.c
+++ b/libpamc/pamc_load.c
@@ -324,7 +324,7 @@ int __pamc_valid_agent_id(int id_length, const char *id)
for (i=post=0 ; i < id_length; ++i) {
int ch = id[i++];
- if (isalpha(ch) || isdigit(ch) || (ch == '_')) {
+ if (isalpha((unsigned char)ch) || isdigit((unsigned char)ch) || (ch == '_')) {
continue;
} else if (post && (ch == '.')) {
continue;