diff --git a/src/Bridges/DITracy/ContainerPanel.php b/src/Bridges/DITracy/ContainerPanel.php
index 3edc13543..fdfef0ac1 100644
--- a/src/Bridges/DITracy/ContainerPanel.php
+++ b/src/Bridges/DITracy/ContainerPanel.php
@@ -40,7 +40,7 @@ public function __construct(Container $container)
 	 */
 	public function getTab()
 	{
-		ob_start(NULL, 0, PHP_OUTPUT_HANDLER_REMOVABLE);
+		ob_start();
 		$elapsedTime = $this->elapsedTime;
 		require __DIR__ . '/templates/ContainerPanel.tab.phtml';
 		return ob_get_clean();
@@ -68,7 +68,7 @@ public function getPanel()
 			}
 		}
 
-		ob_start(NULL, 0, PHP_OUTPUT_HANDLER_REMOVABLE);
+		ob_start();
 		require __DIR__ . '/templates/ContainerPanel.panel.phtml';
 		return ob_get_clean();
 	}