diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -2166,7 +2166,6 @@
     'PhabricatorCountdownTransactionQuery' => 'applications/countdown/query/PhabricatorCountdownTransactionQuery.php',
     'PhabricatorCountdownView' => 'applications/countdown/view/PhabricatorCountdownView.php',
     'PhabricatorCountdownViewController' => 'applications/countdown/controller/PhabricatorCountdownViewController.php',
-    'PhabricatorCredentialsUsedByObjectEdgeType' => 'applications/passphrase/edge/PhabricatorCredentialsUsedByObjectEdgeType.php',
     'PhabricatorCursorPagedPolicyAwareQuery' => 'infrastructure/query/policy/PhabricatorCursorPagedPolicyAwareQuery.php',
     'PhabricatorCustomField' => 'infrastructure/customfield/field/PhabricatorCustomField.php',
     'PhabricatorCustomFieldAttachment' => 'infrastructure/customfield/field/PhabricatorCustomFieldAttachment.php',
@@ -2807,7 +2806,6 @@
     'PhabricatorObjectQuery' => 'applications/phid/query/PhabricatorObjectQuery.php',
     'PhabricatorObjectRemarkupRule' => 'infrastructure/markup/rule/PhabricatorObjectRemarkupRule.php',
     'PhabricatorObjectSelectorDialog' => 'view/control/PhabricatorObjectSelectorDialog.php',
-    'PhabricatorObjectUsesCredentialsEdgeType' => 'applications/transactions/edges/PhabricatorObjectUsesCredentialsEdgeType.php',
     'PhabricatorOffsetPagedQuery' => 'infrastructure/query/PhabricatorOffsetPagedQuery.php',
     'PhabricatorOldWorldContentSource' => 'infrastructure/contentsource/PhabricatorOldWorldContentSource.php',
     'PhabricatorOneTimeTriggerClock' => 'infrastructure/daemon/workers/clock/PhabricatorOneTimeTriggerClock.php',
@@ -6656,7 +6654,6 @@
     'PhabricatorCountdownTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
     'PhabricatorCountdownView' => 'AphrontView',
     'PhabricatorCountdownViewController' => 'PhabricatorCountdownController',
-    'PhabricatorCredentialsUsedByObjectEdgeType' => 'PhabricatorEdgeType',
     'PhabricatorCursorPagedPolicyAwareQuery' => 'PhabricatorPolicyAwareQuery',
     'PhabricatorCustomField' => 'Phobject',
     'PhabricatorCustomFieldAttachment' => 'Phobject',
@@ -7381,7 +7378,6 @@
     'PhabricatorObjectQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
     'PhabricatorObjectRemarkupRule' => 'PhutilRemarkupRule',
     'PhabricatorObjectSelectorDialog' => 'Phobject',
-    'PhabricatorObjectUsesCredentialsEdgeType' => 'PhabricatorEdgeType',
     'PhabricatorOffsetPagedQuery' => 'PhabricatorQuery',
     'PhabricatorOldWorldContentSource' => 'PhabricatorContentSource',
     'PhabricatorOneTimeTriggerClock' => 'PhabricatorTriggerClock',
diff --git a/src/applications/passphrase/controller/PassphraseCredentialViewController.php b/src/applications/passphrase/controller/PassphraseCredentialViewController.php
--- a/src/applications/passphrase/controller/PassphraseCredentialViewController.php
+++ b/src/applications/passphrase/controller/PassphraseCredentialViewController.php
@@ -202,16 +202,6 @@
         $credential->getUsername());
     }
 
-    $used_by_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
-      $credential->getPHID(),
-      PhabricatorCredentialsUsedByObjectEdgeType::EDGECONST);
-
-    if ($used_by_phids) {
-      $properties->addProperty(
-        pht('Used By'),
-        $viewer->renderHandleList($used_by_phids));
-    }
-
     $description = $credential->getDescription();
     if (strlen($description)) {
       $properties->addSectionHeader(
diff --git a/src/applications/passphrase/edge/PhabricatorCredentialsUsedByObjectEdgeType.php b/src/applications/passphrase/edge/PhabricatorCredentialsUsedByObjectEdgeType.php
deleted file mode 100644
--- a/src/applications/passphrase/edge/PhabricatorCredentialsUsedByObjectEdgeType.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-final class PhabricatorCredentialsUsedByObjectEdgeType
-  extends PhabricatorEdgeType {
-
-  const EDGECONST = 40;
-
-  public function getInverseEdgeConstant() {
-    return PhabricatorObjectUsesCredentialsEdgeType::EDGECONST;
-  }
-
-  public function shouldWriteInverseTransactions() {
-    return true;
-  }
-
-}
diff --git a/src/applications/transactions/edges/PhabricatorObjectUsesCredentialsEdgeType.php b/src/applications/transactions/edges/PhabricatorObjectUsesCredentialsEdgeType.php
deleted file mode 100644
--- a/src/applications/transactions/edges/PhabricatorObjectUsesCredentialsEdgeType.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-final class PhabricatorObjectUsesCredentialsEdgeType
-  extends PhabricatorEdgeType {
-
-  const EDGECONST = 39;
-
-  public function getInverseEdgeConstant() {
-    return PhabricatorCredentialsUsedByObjectEdgeType::EDGECONST;
-  }
-
-  public function shouldWriteInverseTransactions() {
-    return true;
-  }
-
-}