diff --git a/migrations/20221204-custom-background.sql b/migrations/20221204-custom-background.sql
index c5ac2e967..f24959b04 100644
--- a/migrations/20221204-custom-background.sql
+++ b/migrations/20221204-custom-background.sql
@@ -1,2 +1,2 @@
-alter table users alter column background type varchar(30);
+alter table users alter column background type varchar(40); -- solarpunk/xx.webp ones are 32 chars, plus leave headroom
 update users set background='/i/backgrounds/' || background || '.webp' where background is not null;