diff --git a/framework/log/Dispatcher.php b/framework/log/Dispatcher.php
index f413053..7a090b9 100644
--- a/framework/log/Dispatcher.php
+++ b/framework/log/Dispatcher.php
@@ -60,6 +60,10 @@ class Dispatcher extends Component
      * or the configuration for creating the log target instance.
      */
     public $targets = [];
+    /**
+     * @var Logger the logger. If not set, [[\Yii::getLogger()]] will be used.
+     */
+    public $logger;
 
     /**
      * Initializes the logger by registering [[flush()]] as a shutdown function.
@@ -74,7 +78,10 @@ class Dispatcher extends Component
             }
         }
 
-        Yii::getLogger()->dispatcher = $this;
+        if ($this->logger === null) {
+            $this->logger = Yii::getLogger();
+        }
+        $this->logger->dispatcher = $this;
     }
 
     /**
@@ -83,7 +90,7 @@ class Dispatcher extends Component
      */
     public function getTraceLevel()
     {
-        return Yii::getLogger()->traceLevel;
+        return $this->logger->traceLevel;
     }
 
     /**
@@ -94,7 +101,7 @@ class Dispatcher extends Component
      */
     public function setTraceLevel($value)
     {
-        Yii::getLogger()->traceLevel = $value;
+        $this->logger->traceLevel = $value;
     }
 
     /**
@@ -103,7 +110,7 @@ class Dispatcher extends Component
      */
     public function getFlushInterval()
     {
-        return Yii::getLogger()->flushInterval;
+        return $this->logger->flushInterval;
     }
 
     /**
@@ -116,7 +123,7 @@ class Dispatcher extends Component
      */
     public function setFlushInterval($value)
     {
-        Yii::getLogger()->flushInterval = $value;
+        $this->logger->flushInterval = $value;
     }
 
     /**
diff --git a/tests/unit/framework/log/TargetTest.php b/tests/unit/framework/log/TargetTest.php
index 035d639..1f2d694 100644
--- a/tests/unit/framework/log/TargetTest.php
+++ b/tests/unit/framework/log/TargetTest.php
@@ -5,6 +5,7 @@
 
 namespace yiiunit\framework\log;
 
+use yii\log\Dispatcher;
 use yii\log\Logger;
 use yii\log\Target;
 use yiiunit\TestCase;
@@ -50,7 +51,9 @@ class TargetTest extends TestCase
     {
         static::$messages = [];
 
-        $logger = new Logger([
+        $logger = new Logger;
+        $dispatcher = new Dispatcher([
+            'logger' => $logger,
             'targets' => [new TestTarget(array_merge($filter, ['logVars' => []]))],
             'flushInterval' => 1,
         ]);