diff --git a/scripts/change_url b/scripts/change_url
index d3d583e..49964f7 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -57,17 +57,20 @@ nginx_conf_path=/etc/nginx/conf.d/$old_domain.d/$app.conf
 # Change the path in the nginx config file
 if [ $change_path -eq 1 ]
 then
+  ynh_backup_if_checksum_is_different "$nginx_conf_path"
   # Replace locations starting with old_path
   # Look for every location possible patterns (see https://nginx.org/en/docs/http/ngx_http_core_module.html#location)
   sudo sed --in-place "s@location\( \(=\|~\|~\*\|\^~\)\)\? $old_path@location\1 $new_path@"  "$nginx_conf_path"
   # Replace path in "return" directives
   sudo sed --in-place "s@return \([[:digit:]]\{3\}\) $old_path@return \1 $new_path@"  "$nginx_conf_path"
+  ynh_store_file_checksum "$nginx_conf_path"
 fi
 
 # Change the domain for nginx
 if [ $change_domain -eq 1 ]
 then
 	mv $nginx_conf_path /etc/nginx/conf.d/$new_domain.d/$app.conf
+  ynh_store_file_checksum "$nginx_conf_path"
 fi
 
 #=================================================