diff --git a/server/migrations/20170904202454-allow-null-username.js b/server/migrations/20170904202454-allow-null-username.js
new file mode 100644
index 000000000..399dc4e8c
--- /dev/null
+++ b/server/migrations/20170904202454-allow-null-username.js
@@ -0,0 +1,15 @@
+module.exports = {
+  up: async function(queryInterface, Sequelize) {
+    await queryInterface.changeColumn('users', 'username', {
+      type: Sequelize.STRING,
+      allowNull: true,
+    });
+  },
+
+  down: async function(queryInterface, Sequelize) {
+    await queryInterface.changeColumn('users', 'username', {
+      type: Sequelize.STRING,
+      allowNull: false,
+    });
+  },
+};