diff --git a/mail/inc/class.mail_wizard.inc.php b/mail/inc/class.mail_wizard.inc.php
index 880f4bdb45..e6f6417634 100644
--- a/mail/inc/class.mail_wizard.inc.php
+++ b/mail/inc/class.mail_wizard.inc.php
@@ -33,5 +33,7 @@ class mail_wizard extends emailadmin_wizard
 
 		// and translations
 		translation::add_app('emailadmin');
+
+		egw_framework::validate_file('/emailadmin/js/app.js');
 	}
 }
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