diff --git a/yii/base/Controller.php b/yii/base/Controller.php
index 0639e2b..543605f 100644
--- a/yii/base/Controller.php
+++ b/yii/base/Controller.php
@@ -8,7 +8,6 @@
 namespace yii\base;
 
 use Yii;
-use yii\helpers\StringHelper;
 
 /**
  * Controller is the base class for classes containing controller logic.
@@ -226,7 +225,7 @@ class Controller extends Component
 		if (isset($actionMap[$id])) {
 			return Yii::createObject($actionMap[$id], $id, $this);
 		} elseif (preg_match('/^[a-z0-9\\-_]+$/', $id)) {
-			$methodName = 'action' . StringHelper::id2camel($id);
+			$methodName = 'action' . str_replace(' ', '', ucwords(implode(' ', explode('-', $id))));
 			if (method_exists($this, $methodName)) {
 				$method = new \ReflectionMethod($this, $methodName);
 				if ($method->getName() === $methodName) {
diff --git a/yii/base/Module.php b/yii/base/Module.php
index 98b03db..ec3001e 100644
--- a/yii/base/Module.php
+++ b/yii/base/Module.php
@@ -8,7 +8,6 @@
 namespace yii\base;
 
 use Yii;
-use yii\helpers\StringHelper;
 
 /**
  * Module is the base class for module and application classes.
@@ -609,7 +608,7 @@ abstract class Module extends Component
 		if (isset($this->controllerMap[$id])) {
 			$controller = Yii::createObject($this->controllerMap[$id], $id, $this);
 		} elseif (preg_match('/^[a-z0-9\\-_]+$/', $id)) {
-			$className = StringHelper::id2camel($id) . 'Controller';
+			$className = str_replace(' ', '', ucwords(implode(' ', explode('-', $id)))) . 'Controller';
 			$classFile = $this->controllerPath . DIRECTORY_SEPARATOR . $className . '.php';
 			if (!is_file($classFile)) {
 				return false;