diff --git a/net/ethtool/tsinfo.c b/net/ethtool/tsinfo.c
index 691be6c445b3..ad3866c5a902 100644
--- a/net/ethtool/tsinfo.c
+++ b/net/ethtool/tsinfo.c
@@ -290,7 +290,8 @@ static void *ethnl_tsinfo_prepare_dump(struct sk_buff *skb,
 	reply_data = ctx->reply_data;
 	memset(reply_data, 0, sizeof(*reply_data));
 	reply_data->base.dev = dev;
-	memset(&reply_data->ts_info, 0, sizeof(reply_data->ts_info));
+	reply_data->ts_info.cmd = ETHTOOL_GET_TS_INFO;
+	reply_data->ts_info.phc_index = -1;
 
 	return ehdr;
 }