diff --git a/helper/bwrap/config.go b/helper/bwrap/config.go
index 6bac6ef..c1ab37c 100644
--- a/helper/bwrap/config.go
+++ b/helper/bwrap/config.go
@@ -9,6 +9,7 @@ import (
 func init() {
 	gob.Register(new(PermConfig[SymlinkConfig]))
 	gob.Register(new(PermConfig[*TmpfsConfig]))
+	gob.Register(new(OverlayConfig))
 }
 
 type Config struct {