diff --git a/interface/lib/classes/validate_cron.inc.php b/interface/lib/classes/validate_cron.inc.php
index c42e06dc9280591977e3d4abe412b6e148776662..d49c2809a18acbfeca7189f8b2fad781d0ff9149 100644
--- a/interface/lib/classes/validate_cron.inc.php
+++ b/interface/lib/classes/validate_cron.inc.php
@@ -55,6 +55,14 @@ class validate_cron {
             if(preg_match("'^([a-z0-9][a-z0-9-]{0,62}\.)+([a-z]{2,30})$'i", $parsed["host"]) == false) return $this->get_error($validator['errmsg']);
         }
     }
+	
+	function run_month_format($field_name, $field_value, $validator) {
+		global $app;
+		//* allow value @reboot in month field
+		if($field_value != '@reboot') {
+			return $this->run_time_format($field_name, $field_value, $validator);
+		}
+	}
     
 	/*
 		Validator function to check if a given cron time is in correct form.
diff --git a/interface/web/sites/form/cron.tform.php b/interface/web/sites/form/cron.tform.php
index fc63548ff859aad1d13f9eff7c30f3510da7889f..3a7bd6deccb11e4ddca58508c3df6c3d274e7271 100644
--- a/interface/web/sites/form/cron.tform.php
+++ b/interface/web/sites/form/cron.tform.php
@@ -129,7 +129,7 @@ $form["tabs"]['cron'] = array (
             'formtype'  => 'TEXT',
             'validators'    => array (  0 => array (    'type'  => 'CUSTOM',
                                                         'class' => 'validate_cron',
-                                                        'function' => 'run_time_format',
+                                                        'function' => 'run_month_format',
                                                         'errmsg'=> 'run_month_error_format'),
                                     ),
             'default'   => '',