diff --git a/db/migrate/20170914032032_default_existing_mutes_to_hiding_notifications.rb b/db/migrate/20170914032032_default_existing_mutes_to_hiding_notifications.rb
new file mode 100644
index 0000000000..e7818f8c39
--- /dev/null
+++ b/db/migrate/20170914032032_default_existing_mutes_to_hiding_notifications.rb
@@ -0,0 +1,8 @@
+class DefaultExistingMutesToHidingNotifications < ActiveRecord::Migration[5.1]
+  def up
+    t.change_column_default :mutes, :hide_notifications, from: false, to: true
+
+    # Unfortunately if this is applied sometime after the one to add the table we lose some data, so this is irreversible.
+    Mutes.update_all(hide_notifications: true)
+  end
+end