1 files changed, 1 insertions, 1 deletions

diff --git a/plugins/check_http.c b/plugins/check_http.c
index 5c8a80c6..63addfcc 100644
--- a/plugins/check_http.c
+++ b/plugins/check_http.c
@@ -285,7 +285,7 @@ process_arguments (int argc, char **argv)
 #ifdef HAVE_SSL
       if ((temp=strchr(optarg,','))!=NULL) {
         *temp='\0';
-        if (!is_intnonneg (temp))
+        if (!is_intnonneg (optarg))
           usage2 (_("Invalid certificate expiration period"), optarg);
         days_till_exp_warn = atoi(optarg);
         *temp=',';