diff --git a/migrations/20210814090340_visit_counter.js b/migrations/20210814090340_visit_counter.js
index b45a672..d3b1f6f 100644
--- a/migrations/20210814090340_visit_counter.js
+++ b/migrations/20210814090340_visit_counter.js
@@ -3,7 +3,7 @@ exports.up = function (knex) {
     return knex.schema.createTable('visits', function (table) {
         table.increments('id').primary();
         table.timestamp('timestamp').defaultTo(knex.fn.now());
-        table.string('shortcode');
+        table.string('shortcode').index();
         table.foreign('shortcode').references('shortcode').inTable('urls');
     });
 };