diff --git a/index.php b/index.php
index c406dd8c0..c00d4fa4d 100644
--- a/index.php
+++ b/index.php
@@ -1,6 +1,7 @@
 <?php
 
-	define('APP_INDEX_ROOT_PATH', str_replace('\\', '/', rtrim(dirname(__FILE__), '\\/').'/'));
+	define('APP_INDEX_ROOT_FILE', str_replace('\\', '/', __FILE__));
+	define('APP_INDEX_ROOT_PATH', rtrim(dirname(APP_INDEX_ROOT_FILE), '/').'/');
 
 	$sCustomDataPath = '';
 	if (file_exists(APP_INDEX_ROOT_PATH.'include.php'))
diff --git a/rainloop/v/0.0.0/index.php b/rainloop/v/0.0.0/index.php
index 478d105ee..c3742274b 100644
--- a/rainloop/v/0.0.0/index.php
+++ b/rainloop/v/0.0.0/index.php
@@ -6,8 +6,8 @@
 		define('APP_INDEX_FILE', 'index.php');
 		define('APP_VERSION_ROOT_PATH', APP_INDEX_ROOT_PATH.'rainloop/v/'.APP_VERSION.'/');
 
-		define('APP_CALLER_ROOT_PATH', empty($_SERVER['SCRIPT_FILENAME']) ? '' : str_replace('\\', '/', rtrim(dirname($_SERVER['SCRIPT_FILENAME']), '\\/').'/'));
-		define('APP_CALLER_AS_API', APP_CALLER_ROOT_PATH !== str_replace('\\', '/', APP_INDEX_ROOT_PATH));
+		define('APP_CALLER_ROOT_FILE', !empty($_SERVER['SCRIPT_FILENAME']) ? str_replace('\\', '/', $_SERVER['SCRIPT_FILENAME']) : '');
+		define('APP_CALLER_AS_API', APP_CALLER_ROOT_FILE !== APP_INDEX_ROOT_FILE);
 
 		if (function_exists('date_default_timezone_set'))
 		{