diff --git a/sql/upgrades/161.sql b/sql/upgrades/161.sql
index cfffc6ed..c2c95c07 100644
--- a/sql/upgrades/161.sql
+++ b/sql/upgrades/161.sql
@@ -1,17 +1,17 @@
 -- SWH DB schema upgrade
 -- from_version: 160
 -- to_version: 161
 -- description: Make revision.extra_headers not null
 
 -- latest schema version
 insert into dbversion(version, release, description)
       values(161, now(), 'Work Still In Progress');
 
 
 update revision
-    set extra_headers = ARRAY[][]
+    set extra_headers = ARRAY[]::bytea[][]
     where extra_headers is null;
 
 
 alter table revision
     alter column extra_headers set not null;