diff --git a/manifest.json b/manifest.json
index 8797b35..eab2505 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,7 @@
         "en": "Forum software that is easy to use, powerful, and highly customisable",
         "fr": "Forum facile à utiliser, puissant et hautement personnalisable"
     },
-    "version": "3.3.8~ynh1",
+    "version": "3.3.8~ynh2",
     "url": "http://www.phpbb.com/",
     "upstream": {
         "license": "GPL-2.0-only",
diff --git a/scripts/upgrade b/scripts/upgrade
index d77cb7f..b5869f1 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -118,6 +118,10 @@ ynh_script_progression --message="Upgrading the $app..." --weight=1
 
 ynh_exec_as $app php${phpversion} "$final_path/bin/phpbbcli.php" --no-interaction db:migrate --safe-mode
 
+if [ -e "$final_path/install_old" ]; then
+	ynh_secure_remove --file="$final_path/install_old"
+fi
+
 if [ -e "$final_path/install" ]; then
 	ynh_exec_as $app mv "$final_path/install" "$final_path/install_old"
 fi