diff --git a/packages/backend/src/config.ts b/packages/backend/src/config.ts
index e02f09bbe1..e1800e43b9 100644
--- a/packages/backend/src/config.ts
+++ b/packages/backend/src/config.ts
@@ -346,7 +346,7 @@ const _dirname = dirname(_filename);
 /**
  * Path of configuration directory
  */
-const dir = `${_dirname}/../../../.config`;
+const dir = process.env.MISSKEY_CONFIG_DIR ?? `${_dirname}/../../../.config`;
 
 /**
  * Path of configuration file