diff --git a/app/constants.php b/app/constants.php
index 9245d0230..064e02116 100644
--- a/app/constants.php
+++ b/app/constants.php
@@ -2,7 +2,7 @@
 
 // Enable/disable debug
 defined('DEBUG') or define('DEBUG', false);
-defined('DEBUG_FILE') or define('DEBUG_FILE', 'data/debug.log');
+defined('DEBUG_FILE') or define('DEBUG_FILE', __DIR__.'/../data/debug.log');
 
 // Application version
 defined('APP_VERSION') or define('APP_VERSION', 'master');
diff --git a/config.default.php b/config.default.php
index a55cec3e4..c6b4599bc 100644
--- a/config.default.php
+++ b/config.default.php
@@ -4,7 +4,7 @@
 define('DEBUG', false);
 
 // Debug file path
-define('DEBUG_FILE', 'data/debug.log');
+define('DEBUG_FILE', __DIR__.'/data/debug.log');
 
 // Folder for uploaded files, don't forget the trailing slash
 define('FILES_DIR', 'data/files/');