diff --git a/src/applications/differential/customfield/DifferentialManiphestTasksField.php b/src/applications/differential/customfield/DifferentialManiphestTasksField.php
index 0f34c12ab8..b13cfcc304 100644
--- a/src/applications/differential/customfield/DifferentialManiphestTasksField.php
+++ b/src/applications/differential/customfield/DifferentialManiphestTasksField.php
@@ -1,114 +1,114 @@
 <?php
 
 final class DifferentialManiphestTasksField
   extends DifferentialCoreCustomField {
 
   public function getFieldKey() {
     return 'differential:maniphest-tasks';
   }
 
   public function getFieldKeyForConduit() {
     return 'maniphestTaskPHIDs';
   }
 
   public function canDisableField() {
     return false;
   }
 
   public function shouldAppearInEditView() {
     return false;
   }
 
   public function getFieldName() {
     return pht('Maniphest Tasks');
   }
 
   public function getFieldDescription() {
     return pht('Lists associated tasks.');
   }
 
   public function shouldAppearInPropertyView() {
     return true;
   }
 
   public function renderPropertyViewLabel() {
     return $this->getFieldName();
   }
 
-  public function readValueFromRevision(DifferentialRevision $revision) {
+  protected function readValueFromRevision(DifferentialRevision $revision) {
     if (!$revision->getPHID()) {
       return array();
     }
 
     return PhabricatorEdgeQuery::loadDestinationPHIDs(
       $revision->getPHID(),
       DifferentialRevisionHasTaskEdgeType::EDGECONST);
   }
 
   public function getApplicationTransactionType() {
     return PhabricatorTransactions::TYPE_EDGE;
   }
 
   public function getApplicationTransactionMetadata() {
     return array(
       'edge:type' => DifferentialRevisionHasTaskEdgeType::EDGECONST,
     );
   }
 
   public function getNewValueForApplicationTransactions() {
     $edges = array();
     foreach ($this->getValue() as $phid) {
       $edges[$phid] = $phid;
     }
 
     return array('=' => $edges);
   }
 
   public function getRequiredHandlePHIDsForPropertyView() {
     return $this->getValue();
   }
 
   public function renderPropertyViewValue(array $handles) {
     return $this->renderHandleList($handles);
   }
 
   public function shouldAppearInCommitMessage() {
     return true;
   }
 
   public function shouldAllowEditInCommitMessage() {
     return true;
   }
 
   public function getCommitMessageLabels() {
     return array(
       'Maniphest Task',
       'Maniphest Tasks',
     );
   }
 
   public function parseValueFromCommitMessage($value) {
     return $this->parseObjectList(
       $value,
       array(
         ManiphestTaskPHIDType::TYPECONST,
       ));
   }
 
   public function getRequiredHandlePHIDsForCommitMessage() {
     return $this->getRequiredHandlePHIDsForPropertyView();
   }
 
   public function renderCommitMessageValue(array $handles) {
     return $this->renderObjectList($handles);
   }
 
   public function getProTips() {
     return array(
       pht(
         'Write "Fixes T123" in your summary to automatically close the '.
         'corresponding task when this change lands.'),
     );
   }
 
 }