diff --git a/scripts/upgrade b/scripts/upgrade
index 6a1a30a..1c1a1b3 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -15,6 +15,16 @@ ynh_script_progression --message="Stopping $app's systemd service..."
 
 ynh_systemd_action --service_name="$app" --action="stop" --log_path="systemd" --line_match="Stopped OFBiz Service"
 
+#=================================================
+# ENSURE DOWNWARD COMPATIBILITY
+#=================================================
+ynh_script_progression --message="Ensuring downward compatibility..." --weight=1
+
+# Remove legacy admin key
+if [ -n "${admin:-}" ]; then
+    ynh_app_setting_delete --app="$app" --key=admin
+fi
+
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================