diff --git a/install/lib/installer_base.lib.php b/install/lib/installer_base.lib.php
index 19ce6cadf846dd1d9e16473b758e470bbeb35105..ea49af6f5fd1eab09e08bafa17e3fa8a45f93a47 100644
--- a/install/lib/installer_base.lib.php
+++ b/install/lib/installer_base.lib.php
@@ -894,7 +894,7 @@ class installer_base {
 		wf($full_file_name, '/^/ FILTER amavis:[127.0.0.1]:10024');
 
 		//* Changing mode and group of the new created config files.
-		caselog('chmod o= '.$config_dir.'/mysql-virtual_*.cf* &> /dev/null',
+		caselog('chmod u=rw,g=r,o= '.$config_dir.'/mysql-virtual_*.cf* &> /dev/null',
 			__FILE__, __LINE__, 'chmod on mysql-virtual_*.cf*', 'chmod on mysql-virtual_*.cf* failed');
 		caselog('chgrp '.$cf['group'].' '.$config_dir.'/mysql-virtual_*.cf* &> /dev/null',
 			__FILE__, __LINE__, 'chgrp on mysql-virtual_*.cf*', 'chgrp on mysql-virtual_*.cf* failed');