diff --git a/src/applications/differential/storage/DifferentialTransaction.php b/src/applications/differential/storage/DifferentialTransaction.php
--- a/src/applications/differential/storage/DifferentialTransaction.php
+++ b/src/applications/differential/storage/DifferentialTransaction.php
@@ -227,7 +227,7 @@
         $tags[] = self::MAILTAG_REVIEWERS;
         break;
       case DifferentialRevisionCloseTransaction::TRANSACTIONTYPE:
-        $tags[] = self::MAILTAG_CLSOED;
+        $tags[] = self::MAILTAG_CLOSED;
         break;
     }