diff --git a/src/applications/maniphest/command/ManiphestAssignEmailCommand.php b/src/applications/maniphest/command/ManiphestAssignEmailCommand.php
index 9d2a51b107..98e8a913a8 100644
--- a/src/applications/maniphest/command/ManiphestAssignEmailCommand.php
+++ b/src/applications/maniphest/command/ManiphestAssignEmailCommand.php
@@ -34,6 +34,7 @@ final class ManiphestAssignEmailCommand
     array $argv) {
     $xactions = array();
 
+    $assign_phid = null;
 
     $assign_to = head($argv);
     if ($assign_to) {