diff --git a/helper/bwrap/config.go b/helper/bwrap/config.go
index f62cc24..0aad6de 100644
--- a/helper/bwrap/config.go
+++ b/helper/bwrap/config.go
@@ -1,10 +1,16 @@
 package bwrap
 
 import (
+	"encoding/gob"
 	"os"
 	"strconv"
 )
 
+func init() {
+	gob.Register(new(PermConfig[SymlinkConfig]))
+	gob.Register(new(PermConfig[*TmpfsConfig]))
+}
+
 type Config struct {
 	// unshare every namespace we support by default if nil
 	// (--unshare-all)