diff --git a/xwords4/relay/xwrelay.sh b/xwords4/relay/xwrelay.sh
index 5a50d1fc7..e46ad56fa 100755
--- a/xwords4/relay/xwrelay.sh
+++ b/xwords4/relay/xwrelay.sh
@@ -74,7 +74,7 @@ id SERIAL
 ,msg BYTEA
 ,msg64 TEXT
 ,msglen INTEGER
-,UNIQUE ( connName, hid, msg )
+,oneOnly UNIQUE ( connName, hid, msg64, stime )
 );
 EOF