diff --git a/config/config.go b/config/config.go
index 4461380..a612b92 100644
--- a/config/config.go
+++ b/config/config.go
@@ -98,6 +98,7 @@ type VolumeDef struct {
 }
 
 type MountDef struct {
+    Type    string
 	Dev     string
 	Path    string
 	Options string