diff --git a/CRM/Civicase/Hook/BuildForm/HandleDraftActivities.php b/CRM/Civicase/Hook/BuildForm/HandleDraftActivities.php
index 8205aeb8e..4dc8354e7 100644
--- a/CRM/Civicase/Hook/BuildForm/HandleDraftActivities.php
+++ b/CRM/Civicase/Hook/BuildForm/HandleDraftActivities.php
@@ -149,6 +149,10 @@ private function addSaveDraftButton(CRM_Core_Form &$form, $formName) {
         $form->setDefaults($draft);
       }
     }
+    $caseId = CRM_Utils_Request::retrieve('caseid', 'String');
+    if ($formName === self::PDF_LETTER_FORM_NAME && !empty($caseId)) {
+      $form->addElement('hidden', 'caseid', $caseId);
+    }
   }
 
   /**