diff --git a/scripts/gitolite/rebuild_gitolite.php b/scripts/gitolite/rebuild_gitolite.php
index bc2dd4fce5..1e4045cc1d 100755
--- a/scripts/gitolite/rebuild_gitolite.php
+++ b/scripts/gitolite/rebuild_gitolite.php
@@ -66,6 +66,8 @@ class Configuration {
     $this->config_file = "$gitolite_root/conf/gitolite.conf";
 
     $this->collectSystemPublicKeys();
+
+    $this->used_keys = array();
     $this->committers = array();
 
     if (!file_exists($this->config_file)) {
@@ -121,8 +123,10 @@ class Configuration {
         $variable_name = trim($parts[0]);
         if (array_key_exists($variable_name, $this->committers)) {
           $system_committers = $this->getNonPhabtricatorUsers($parts[1]);
-          $committers = implode(' ', array_merge(
-              $system_committers, $this->committers[$variable_name]));
+          $all_committers = array_merge(
+              $system_committers, $this->committers[$variable_name]);
+          $unique_committers = array_unique($all_committers);
+          $committers = implode(' ', $unique_committers);
           $line = "$variable_name = $committers";
         }
       }