diff --git a/timeoutd.c b/timeoutd.c
index c684da5..841ad90 100644
--- a/timeoutd.c
+++ b/timeoutd.c
@@ -850,8 +850,8 @@ int session;
 
 void check_idle()
 {                               /* Check for exceeded time limits & logoff exceeders */
-    char user[sizeof(utmpp->ut_user)];
-    char host[sizeof(utmpp->ut_host)];
+    char user[sizeof(utmpp->ut_user) + 1];
+    char host[sizeof(utmpp->ut_host) + 1];
     struct stat status, *pstat;
     time_t idle, sesstime;
     short aktconfigline = -1;   /* -1 if user is in config; >0 if he's not in config, * is handled in an other way */