diff --git a/src/applications/passphrase/storage/PassphraseCredential.php b/src/applications/passphrase/storage/PassphraseCredential.php
--- a/src/applications/passphrase/storage/PassphraseCredential.php
+++ b/src/applications/passphrase/storage/PassphraseCredential.php
@@ -1,7 +1,8 @@
 <?php
 
 final class PassphraseCredential extends PassphraseDAO
-  implements PhabricatorPolicyInterface {
+  implements PhabricatorPolicyInterface,
+  PhabricatorDestructibleInterface {
 
   protected $name;
   protected $credentialType;
@@ -83,4 +84,19 @@
     return null;
   }
 
+/* -(  PhabricatorDestructibleInterface  )----------------------------------- */
+
+  public function destroyObjectPermanently(
+    PhabricatorDestructionEngine $engine) {
+
+    $this->openTransaction();
+      $secrets = id(new PassphraseSecret())->loadAllWhere(
+        'id = %d',
+        $this->getSecretID());
+      foreach ($secrets as $secret) {
+        $secret->delete();
+      }
+      $this->delete();
+    $this->saveTransaction();
+  }
 }
diff --git a/src/applications/system/interface/PhabricatorDestructibleInterface.php b/src/applications/system/interface/PhabricatorDestructibleInterface.php
--- a/src/applications/system/interface/PhabricatorDestructibleInterface.php
+++ b/src/applications/system/interface/PhabricatorDestructibleInterface.php
@@ -11,7 +11,7 @@
 // TEMPLATE IMPLEMENTATION /////////////////////////////////////////////////////
 
 
-/* -(  PhabricatorDestructableInterface  )----------------------------------- */
+/* -(  PhabricatorDestructibleInterface  )----------------------------------- */
 /*
 
   public function destroyObjectPermanently(