diff --git a/db/migrate/20101104182107_add_unique_index_on_members.rb b/db/migrate/20101104182107_add_unique_index_on_members.rb
index ff7297084..ac51313b1 100644
--- a/db/migrate/20101104182107_add_unique_index_on_members.rb
+++ b/db/migrate/20101104182107_add_unique_index_on_members.rb
@@ -17,5 +17,6 @@ class AddUniqueIndexOnMembers < ActiveRecord::Migration
   end
 
   def self.down
+    remove_index :members, [:user_id, :project_id]
   end
 end