diff --git a/db/migrate/20091021145813_add_unique_index_to_gem_namespace_ownerships_namespace.rb b/db/migrate/20091021145813_add_unique_index_to_gem_namespace_ownerships_namespace.rb
new file mode 100644
index 0000000..1128c0b
--- /dev/null
+++ b/db/migrate/20091021145813_add_unique_index_to_gem_namespace_ownerships_namespace.rb
@@ -0,0 +1,10 @@
+class AddUniqueIndexToGemNamespaceOwnershipsNamespace < ActiveRecord::Migration
+
+  def self.up
+    add_index :gem_namespace_ownerships, :namespace, :unique => true
+  end
+
+  def self.down
+    remove_index :gem_namespace_ownerships, :namespace
+  end
+end