diff --git a/scripts/upgrade b/scripts/upgrade
index 27a3b21..98a293e 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -121,9 +121,9 @@ ynh_add_fpm_config
 
 ### Verify the checksum of a file, stored by `ynh_store_file_checksum` in the install script.
 ### And create a backup of this file if the checksum is different. So the file will be backed up if the admin had modified it.
-#ynh_backup_if_checksum_is_different "$final_path/CONFIG_FILE"
+ynh_backup_if_checksum_is_different "$final_path/config.php"
 # Recalculate and store the checksum of the file for the next upgrade.
-#ynh_store_file_checksum "$final_path/CONFIG_FILE"
+ynh_store_file_checksum "$final_path/config.php"
 
 #=================================================
 # SETUP LOGROTATE