diff --git a/server/mods-available/monitor_core_module.inc.php b/server/mods-available/monitor_core_module.inc.php
index 683db1e62a334a49b0dd1d9ef450fffad7340f4d..044f079d5eed6e98e49b34f9608d1832618bfd04 100644
--- a/server/mods-available/monitor_core_module.inc.php
+++ b/server/mods-available/monitor_core_module.inc.php
@@ -702,7 +702,7 @@ class monitor_core_module {
          */
         $min = date('i');
         $hour = date('H');
-        if !($min == 0 && $hour == 23) return;
+        if (!($min == 0 && $hour == 23)) return;
 
         global $app;
         global $conf;