diff --git a/migrations/schema.sql b/migrations/schema.sql
index ad3d0f876..b2d51edc1 100644
--- a/migrations/schema.sql
+++ b/migrations/schema.sql
@@ -237,6 +237,7 @@ CREATE TABLE IF NOT EXISTS appPasswords(
     identifier VARCHAR(128) NOT NULL, // resourceId: app id or mail or webadmin
     hashedPassword VARCHAR(1024) NOT NULL,
     creationTime TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE KEY appPasswords_name_appId_identifier (name, userId, identifier)
     FOREIGN KEY(userId) REFERENCES users(id),
 
     PRIMARY KEY (id)