diff --git a/CRM/Admin/Form/DonrecProfile.php b/CRM/Admin/Form/DonrecProfile.php
index 36e946a..5b298b7 100644
--- a/CRM/Admin/Form/DonrecProfile.php
+++ b/CRM/Admin/Form/DonrecProfile.php
@@ -618,6 +618,16 @@ public function validate() {
   /**
    * Process the form submission.
    */
+
+  /**
+   * {@inheritDoc}
+   */
+  protected function getFieldsToExcludeFromPurification(): array {
+    // Prevent HTML template from being sanitized.
+    // @see \CRM_Core_Form::setPurifiedDefaults()
+    return ['template'];
+  }
+
   public function postProcess() {
     $session = CRM_Core_Session::singleton();