diff --git a/library/Icinga/File/Pdf.php b/library/Icinga/File/Pdf.php
index 3212cddc44..78f3db8640 100644
--- a/library/Icinga/File/Pdf.php
+++ b/library/Icinga/File/Pdf.php
@@ -8,6 +8,7 @@
 use Dompdf\Dompdf;
 use Dompdf\Options;
 use Exception;
+use Icinga\Application\Hook;
 use Icinga\Application\Hook\PdfexportHook;
 use Icinga\Application\Icinga;
 use Icinga\Exception\ProgrammingError;
@@ -56,7 +57,7 @@ public function renderControllerAction($controller)
 
         $request = $controller->getRequest();
 
-        if (PdfexportHook::isRegistered()) {
+        if (Hook::has('Pdfexport')) {
             $pdfexport = PdfexportHook::first();
             $pdfexport->streamPdfFromHtml($html, sprintf(
                 '%s-%s-%d',
diff --git a/library/Icinga/Web/Widget/Tabextension/OutputFormat.php b/library/Icinga/Web/Widget/Tabextension/OutputFormat.php
index 729d77cd1e..7fd2802e97 100644
--- a/library/Icinga/Web/Widget/Tabextension/OutputFormat.php
+++ b/library/Icinga/Web/Widget/Tabextension/OutputFormat.php
@@ -5,7 +5,6 @@
 
 namespace Icinga\Web\Widget\Tabextension;
 
-use Icinga\Application\Hook\PdfexportHook;
 use Icinga\Application\Platform;
 use Icinga\Application\Hook;
 use Icinga\Web\Url;
@@ -85,7 +84,7 @@ public function getSupportedTypes()
     {
         $supportedTypes = array();
 
-        $pdfexport = PdfexportHook::isRegistered();
+        $pdfexport = Hook::has('Pdfexport');
 
         if ($pdfexport || Platform::extensionLoaded('gd')) {
             $supportedTypes[self::TYPE_PDF] = array(