diff --git a/apps/bootstrap/index.php b/apps/bootstrap/index.php
index d9aca6f..d4b447a 100644
--- a/apps/bootstrap/index.php
+++ b/apps/bootstrap/index.php
@@ -3,7 +3,7 @@
 defined('YII_DEBUG') or define('YII_DEBUG', true);
 
 $frameworkPath = __DIR__ . '/../../framework/';
-require($frameworkPath . 'yii.php');
+require($frameworkPath . 'Yii.php');
 
 $config = require(__DIR__ . '/protected/config/main.php');
 $application = new yii\web\Application($config);
diff --git a/build/build b/build/build
index 691eba9..95b51e4 100755
--- a/build/build
+++ b/build/build
@@ -11,7 +11,7 @@
 // fcgi doesn't have STDIN defined by default
 defined('STDIN') or define('STDIN', fopen('php://stdin', 'r'));
 
-require(__DIR__ . '/../framework/yii.php');
+require(__DIR__ . '/../framework/Yii.php');
 
 $id = 'yiic-build';
 $basePath = __DIR__;
diff --git a/framework/yii.php b/framework/Yii.php
similarity index 100%
rename from framework/yii.php
rename to framework/Yii.php
diff --git a/framework/yiic.php b/framework/yiic.php
index 3872e2f..7cd0c40 100644
--- a/framework/yiic.php
+++ b/framework/yiic.php
@@ -12,7 +12,7 @@ defined('YII_DEBUG') or define('YII_DEBUG', true);
 // fcgi doesn't have STDIN defined by default
 defined('STDIN') or define('STDIN', fopen('php://stdin', 'r'));
 
-require(__DIR__ . '/yii.php');
+require(__DIR__ . '/Yii.php');
 
 $application = new yii\console\Application(array(
 	'id' => 'yiic',
diff --git a/tests/unit/bootstrap.php b/tests/unit/bootstrap.php
index 8290bbe..58a931b 100644
--- a/tests/unit/bootstrap.php
+++ b/tests/unit/bootstrap.php
@@ -5,7 +5,7 @@ define('YII_DEBUG', true);
 $_SERVER['SCRIPT_NAME'] = '/' . __DIR__;
 $_SERVER['SCRIPT_FILENAME'] = __FILE__;
 
-require_once(__DIR__ . '/../../framework/yii.php');
+require_once(__DIR__ . '/../../framework/Yii.php');
 
 Yii::setAlias('@yiiunit', __DIR__);
 
diff --git a/tests/web/app/index.php b/tests/web/app/index.php
index 4cfa1ab..72d3189 100644
--- a/tests/web/app/index.php
+++ b/tests/web/app/index.php
@@ -1,6 +1,6 @@
 <?php
 
-require(__DIR__ . '/../../../framework/yii.php');
+require(__DIR__ . '/../../../framework/Yii.php');
 
 $application = new yii\web\Application('test', __DIR__ . '/protected');
 $application->run();