diff --git a/dashcaddy-api/self-updater.js b/dashcaddy-api/self-updater.js
index a2ae0a0..665f5ea 100644
--- a/dashcaddy-api/self-updater.js
+++ b/dashcaddy-api/self-updater.js
@@ -49,7 +49,7 @@ class SelfUpdater extends EventEmitter {
       // hostUpdatesDir is the HOST path that maps to updatesDir inside the container.
       // Used when writing trigger.json so the host-side script can find staging files.
       hostUpdatesDir: options.hostUpdatesDir || (platformPaths.isWindows ? options.updatesDir || DEFAULTS.UPDATES_DIR : '/opt/dashcaddy/updates'),
-      apiSourceDir: options.apiSourceDir || DEFAULTS.API_SOURCE_DIR,
+      apiSourceDir: options.apiSourceDir || process.env.DASHCADDY_API_SOURCE_DIR || DEFAULTS.API_SOURCE_DIR,
       frontendDir: options.frontendDir || DEFAULTS.FRONTEND_DIR,
       maxBackups: parseInt(options.maxBackups || DEFAULTS.MAX_BACKUPS, 10),
       channel: options.channel || process.env.DASHCADDY_UPDATE_CHANNEL || DEFAULTS.CHANNEL,