diff --git a/src/db-objects/forms/form-frontend-output-handler.php b/src/db-objects/forms/form-frontend-output-handler.php
index b0effe5e4..e01d478b3 100644
--- a/src/db-objects/forms/form-frontend-output-handler.php
+++ b/src/db-objects/forms/form-frontend-output-handler.php
@@ -257,6 +257,8 @@ protected function render_form_content( $form, $submission = null ) {
 			$template_data['hidden_fields'] .= '<input type="hidden" name="torro_submission[original_form_id]" value="' . esc_attr( get_the_ID() ) . '">';
 		}
 
+        $template_data['hidden_fields'] = apply_filters("{$prefix}hidden_fields", $template_data['hidden_fields'], $form, $submission);
+
 		/**
 		 * Filters the CSS class to use for every button for a form in the frontend.
 		 *