diff --git a/migrations/068_add_stat_referrer_site_id_index.rb b/migrations/068_add_stat_referrer_site_id_index.rb
new file mode 100644
index 00000000..8bd91a7b
--- /dev/null
+++ b/migrations/068_add_stat_referrer_site_id_index.rb
@@ -0,0 +1,9 @@
+Sequel.migration do
+  up {
+    DB.add_index :stat_referrers, :site_id
+  }
+
+  down {
+    DB.drop_index :stat_referrers, :site_id
+  }
+end