diff --git a/setup/unattended-install/unattended-install.php b/setup/unattended-install/unattended-install.php
index 4151318add..bb48378976 100644
--- a/setup/unattended-install/unattended-install.php
+++ b/setup/unattended-install/unattended-install.php
@@ -401,6 +401,7 @@ function PrintUsageAndExit()
 	if ($bUseItopConfig && is_file("$sConfigFile.backup"))
 	{
 		echo "\nuse config file provided by backup in $sConfigFile.";
+		chmod($sConfigFile, 0660);
 		copy("$sConfigFile.backup", $sConfigFile);
 	}