diff --git a/up/invitations.sql b/up/invitations.sql
index 72bc8cfad..10d8f8c10 100644
--- a/up/invitations.sql
+++ b/up/invitations.sql
@@ -6,3 +6,5 @@ CREATE TABLE invitations (
     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
     updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
 );
+
+ALTER TABLE invitations ADD CONSTRAINT invitations_uniqkey UNIQUE (sender_id, receiver_id, music_session_id);