diff --git a/src/core/partitiontable.h b/src/core/partitiontable.h
index e94a015..19bc21e 100644
--- a/src/core/partitiontable.h
+++ b/src/core/partitiontable.h
@@ -57,7 +57,8 @@ public:
         pc98,
         amiga,
         sun,
-        vmd  /* Volume Manager Device */
+        vmd,  /* Volume Manager Device */
+        none, /* Single FileSystem devices */
     };
 
     /** Partition flags */