diff --git a/tpl/Reservation/approve.tpl b/tpl/Reservation/approve.tpl
index f78b0b507..61ae4a2b5 100644
--- a/tpl/Reservation/approve.tpl
+++ b/tpl/Reservation/approve.tpl
@@ -41,7 +41,7 @@
                     <div>{translate key=DeleteReminderWarning}</div>
                     <div>
                         <label for="deleteReason" class="fw-bold">{translate key=Reason} ({translate key=Optional})</label>
-                        <textarea id="deleteReason" class="form-control"></textarea>
+                        <textarea id="deleteReason" class="deleteReason form-control"></textarea>
                     </div>
                 </div>
                 <div class="modal-footer">