diff --git a/app/models/repository.rb b/app/models/repository.rb
index 9ae09e722..4d2ccefaa 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -281,9 +281,8 @@ class Repository < ActiveRecord::Base
         new_user_id = h[committer]
         if new_user_id && (new_user_id.to_i != user_id.to_i)
           new_user_id = (new_user_id.to_i > 0 ? new_user_id.to_i : nil)
-          Changeset.update_all(
-               "user_id = #{ new_user_id.nil? ? 'NULL' : new_user_id }",
-               ["repository_id = ? AND committer = ?", id, committer])
+          Changeset.where(["repository_id = ? AND committer = ?", id, committer]).
+            update_all("user_id = #{new_user_id.nil? ? 'NULL' : new_user_id}")
         end
       end
       @committers            = nil