diff --git a/src/applications/almanac/util/AlmanacKeys.php b/src/applications/almanac/util/AlmanacKeys.php
--- a/src/applications/almanac/util/AlmanacKeys.php
+++ b/src/applications/almanac/util/AlmanacKeys.php
@@ -57,15 +57,6 @@
   }
 
   public static function getClusterSSHUser() {
-    // NOTE: When instancing, we currently use the SSH username to figure out
-    // which instance you are connecting to. We can't use the host name because
-    // we have no way to tell which host you think you're reaching: the SSH
-    // protocol does not have a mechanism like a "Host" header.
-    $username = PhabricatorEnv::getEnvConfig('cluster.instance');
-    if (strlen($username)) {
-      return $username;
-    }
-
     $username = PhabricatorEnv::getEnvConfig('diffusion.ssh-user');
     if (strlen($username)) {
       return $username;