diff --git a/db/migrate/20090503121505_populate_member_roles.rb b/db/migrate/20090503121505_populate_member_roles.rb
index 8b7c987..aae9fc6 100644
--- a/db/migrate/20090503121505_populate_member_roles.rb
+++ b/db/migrate/20090503121505_populate_member_roles.rb
@@ -1,5 +1,6 @@
 class PopulateMemberRoles < ActiveRecord::Migration
   def self.up
+    MemberRole.delete_all
     Member.find(:all).each do |member|
       MemberRole.create!(:member_id => member.id, :role_id => member.role_id)
     end