diff --git a/src/Form/FillPdfFormForm.php b/src/Form/FillPdfFormForm.php
index aaab5e5abe4f7ae9d32c83ff59c95682307b6aa4..87d3234b118419d19926d7b865fa73ac312d0773 100644
--- a/src/Form/FillPdfFormForm.php
+++ b/src/Form/FillPdfFormForm.php
@@ -414,7 +414,7 @@ class FillPdfFormForm extends ContentEntityForm {
           'warning' => [$fillpdf_form_fields_empty_message],
         ],
         '#status_headings' => [
-          'warning' => t('Warning message'),
+          'warning' => $this->t('Warning message'),
         ],
       ];
     }