diff --git a/system/Test/FeatureTestCase.php b/system/Test/FeatureTestCase.php
index b325aa3f5145..6f83b9e01bd0 100644
--- a/system/Test/FeatureTestCase.php
+++ b/system/Test/FeatureTestCase.php
@@ -34,6 +34,13 @@ class FeatureTestCase extends CIDatabaseTestCase
 	 */
 	protected $session = [];
 
+	/**
+	 * Enabled auto clean op buffer after request call
+	 *
+	 * @var bool
+	 */
+	protected $clean = true;
+
 	/**
 	 * Sets a RouteCollection that will override
 	 * the application's route collection.
@@ -115,7 +122,7 @@ public function call(string $method, string $path, array $params = null)
 			->run($this->routes, true);
 
 		// Clean up any open output buffers
-		if (ob_get_level() > 0)
+		if (ob_get_level() > 0 && $this->clean)
 		{
 			ob_end_clean();
 		}
diff --git a/tests/system/Test/FeatureTestCaseTest.php b/tests/system/Test/FeatureTestCaseTest.php
index 80345b894540..f6216ba978dd 100644
--- a/tests/system/Test/FeatureTestCaseTest.php
+++ b/tests/system/Test/FeatureTestCaseTest.php
@@ -14,6 +14,7 @@ public function setUp()
 		parent::setUp();
 
 		$this->skipEvents();
+		$this->clean = false;
 	}
 
 	public function testCallGet()