diff --git a/src/index.php b/src/index.php
index 1c7d010..83f308b 100644
--- a/src/index.php
+++ b/src/index.php
@@ -16,7 +16,7 @@ class SyncedTimer
     private $_basepath;
     private $_resourcePath;
     private $_path;
-    private $_dataFile = "/config/data/data.json";
+    private $_dataFile;
     private $_storageHelper;
 
     public function __construct($translations)
@@ -24,6 +24,7 @@ class SyncedTimer
         session_start();
         $this->_translations = $translations;
 
+        $this->_dataFile = file_exists("/.dockerenv") ? "/config/data/data.json":"./data.json";
         $this->_storageHelper = new StorageHelper($this->_dataFile);
 
         $this->_calculateBasepath();