diff --git a/src/Common/Dlgcode.h b/src/Common/Dlgcode.h
index 74e1a59a..588fea41 100644
--- a/src/Common/Dlgcode.h
+++ b/src/Common/Dlgcode.h
@@ -487,7 +487,8 @@ struct HostDevice
 		IsVirtualPartition (false),
 		HasUnencryptedFilesystem (false),
 		Removable (false),
-		Size (0)
+		Size (0),
+		SystemNumber((uint32) -1)
 	{
 	}