diff --git a/backend/migrations/0010_users.sql b/backend/migrations/0010_users.sql
index d36847e..75c286c 100644
--- a/backend/migrations/0010_users.sql
+++ b/backend/migrations/0010_users.sql
@@ -1,5 +1,5 @@
 CREATE TABLE IF NOT EXISTS users (
   id INTEGER PRIMARY KEY,
-  username VARCHAR(255) NOT NULL,
+  username VARCHAR(255) NOT NULL UNIQUE,
   password VARCHAR(255) NOT NULL
 );
\ No newline at end of file