diff --git a/src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/Api/PacketCaptureController.php b/src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/Api/PacketCaptureController.php
index 9bcf417b7..ccabf7c09 100644
--- a/src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/Api/PacketCaptureController.php
+++ b/src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/Api/PacketCaptureController.php
@@ -159,9 +159,7 @@ class PacketCaptureController extends ApiMutableModelControllerBase
             $this->response->setRawHeader("Content-length: " . filesize($payload['filename']));
             $this->response->setRawHeader("Pragma: no-cache");
             $this->response->setRawHeader("Expires: 0");
-            ob_clean();
-            flush();
-            readfile($payload['filename']);
+            $this->response->setContent(fopen($payload['filename'], 'r'));
         }
     }