diff --git a/src/basic/linux/ethtool.h b/src/basic/linux/ethtool.h
index 34f5dabd33..3bd99694a1 100644
--- a/src/basic/linux/ethtool.h
+++ b/src/basic/linux/ethtool.h
@@ -680,6 +680,7 @@ enum ethtool_link_ext_substate_module {
  * @ETH_SS_STATS_ETH_CTRL: names of IEEE 802.3 MAC Control statistics
  * @ETH_SS_STATS_RMON: names of RMON statistics
  * @ETH_SS_STATS_PHY: names of PHY(dev) statistics
+ * @ETH_SS_TS_FLAGS: hardware timestamping flags
  *
  * @ETH_SS_COUNT: number of defined string sets
  */
@@ -706,6 +707,7 @@ enum ethtool_stringset {
 	ETH_SS_STATS_ETH_CTRL,
 	ETH_SS_STATS_RMON,
 	ETH_SS_STATS_PHY,
+	ETH_SS_TS_FLAGS,
 
 	/* add new constants above here */
 	ETH_SS_COUNT