diff --git a/helper/bwrap/config.go b/helper/bwrap/config.go
index 6fdb08d..3ddb80b 100644
--- a/helper/bwrap/config.go
+++ b/helper/bwrap/config.go
@@ -259,7 +259,7 @@ func (p PermConfig[T]) Value(arg string) (args []string) {
 	// max possible size
 	if p.Mode != nil {
 		args = make([]string, 0, 6)
-		args = append(args, "--perms", strconv.Itoa(int(*p.Mode)))
+		args = append(args, "--perms", strconv.FormatInt(int64(*p.Mode), 8))
 	} else {
 		args = make([]string, 0, 4)
 	}
diff --git a/helper/bwrap/config.pair.go b/helper/bwrap/config.pair.go
index b0b1001..049edaf 100644
--- a/helper/bwrap/config.pair.go
+++ b/helper/bwrap/config.pair.go
@@ -47,7 +47,7 @@ func (c *Config) pairArgs() (n [pairC][][2]string) {
 
 	n[Chmod] = make([][2]string, 0, len(c.Chmod))
 	for path, octal := range c.Chmod {
-		n[Chmod] = append(n[Chmod], [2]string{strconv.Itoa(int(octal)), path})
+		n[Chmod] = append(n[Chmod], [2]string{strconv.FormatInt(int64(octal), 8), path})
 	}
 
 	return