diff --git a/resources/sql/autopatches/20141113.auditdupes.php b/resources/sql/autopatches/20141113.auditdupes.php
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20141113.auditdupes.php
@@ -0,0 +1,22 @@
+<?php
+
+$table = new PhabricatorRepositoryAuditRequest();
+$conn_w = $table->establishConnection('w');
+
+echo "Removing duplicate Audit requests...\n";
+$seen_audit_map = array();
+foreach (new LiskMigrationIterator($table) as $request) {
+  $commit_phid = $request->getCommitPHID();
+  $auditor_phid = $request->getAuditorPHID();
+  if (isset($seen_audit_map[$commit_phid][$auditor_phid])) {
+    $request->delete();
+  }
+
+  if (!isset($seen_audit_map[$commit_phid])) {
+    $seen_audit_map[$commit_phid] = array();
+  }
+
+  $seen_audit_map[$commit_phid][$auditor_phid] = 1;
+}
+
+echo "Done.\n";
diff --git a/src/applications/repository/storage/PhabricatorRepositoryAuditRequest.php b/src/applications/repository/storage/PhabricatorRepositoryAuditRequest.php
--- a/src/applications/repository/storage/PhabricatorRepositoryAuditRequest.php
+++ b/src/applications/repository/storage/PhabricatorRepositoryAuditRequest.php
@@ -27,6 +27,10 @@
         'auditorPHID' => array(
           'columns' => array('auditorPHID', 'auditStatus'),
         ),
+        'key_unique' => array(
+          'columns' => array('commitPHID', 'auditorPHID'),
+          'unique' => true,
+        ),
       ),
     ) + parent::getConfiguration();
   }