1 files changed, 2 insertions, 2 deletions

diff --git a/plugins/check_smtp.d/config.h b/plugins/check_smtp.d/config.h
index b0d42ed1..47826362 100644
--- a/plugins/check_smtp.d/config.h
+++ b/plugins/check_smtp.d/config.h
@@ -40,8 +40,8 @@ typedef struct {
 
         bool use_proxy_prefix;
 #ifdef HAVE_SSL
-        int days_till_exp_warn;
-        int days_till_exp_crit;
+        unsigned int days_till_exp_warn;
+        unsigned int days_till_exp_crit;
         bool use_ssl;
         bool use_starttls;
         bool use_sni;