diff --git a/go/enclave/storage/init/edgelessdb/001_init.sql b/go/enclave/storage/init/edgelessdb/001_init.sql
index b9bd60627f..098ff49602 100644
--- a/go/enclave/storage/init/edgelessdb/001_init.sql
+++ b/go/enclave/storage/init/edgelessdb/001_init.sql
@@ -43,7 +43,7 @@ create table if not exists obsdb.l1_msg
 (
     id      INTEGER AUTO_INCREMENT,
     message varbinary(1024) NOT NULL,
-    block   binary(32)      NOT NULL,
+    block   binary(16)      NOT NULL,
     is_transfer boolean     NOT NULL,
     INDEX (block),
     primary key (id)