diff --git a/services/tasks/src/services/update-user-with-unique-username.js b/services/tasks/src/services/update-user-with-unique-username.js
index 65c2144..0895604 100644
--- a/services/tasks/src/services/update-user-with-unique-username.js
+++ b/services/tasks/src/services/update-user-with-unique-username.js
@@ -35,8 +35,8 @@ module.exports = async function updateUserWithUniqueUsername(
         username = ${username}
       WHERE
         id = ${userId}
-        AND username IS NULL
-        OR username = ''
+        AND (username IS NULL
+          OR username = '')
       RETURNING
         id
       `