diff --git a/media/mtp/MtpProperty.h b/media/mtp/MtpProperty.h
index 4923d40..c5b4e28 100644
--- a/media/mtp/MtpProperty.h
+++ b/media/mtp/MtpProperty.h
@@ -42,6 +42,8 @@
         kFormRange = 1,
         kFormEnum = 2,
     };
+
+    uint32_t            mGroupCode;
     uint8_t             mFormFlag;
 
     // for range form