diff --git a/os_if/linux/qca_vendor.h b/os_if/linux/qca_vendor.h
index 283a4e9c52ce..6653dbed4daf 100644
--- a/os_if/linux/qca_vendor.h
+++ b/os_if/linux/qca_vendor.h
@@ -1252,6 +1252,14 @@ enum qca_wlan_vendor_attr {
 	 * to report the corresponding antenna index to the chain RSSI value
 	 */
 	QCA_WLAN_VENDOR_ATTR_ANTENNA_INFO = 40,
+	/*
+	 * Used in QCA_NL80211_VENDOR_SUBCMD_GET_CHAIN_RSSI command
+	 * to report the specific antenna EVM value (unsigned 32 bit value).
+	 * With a determinate group of antennas, the driver specifies the
+	 * EVM value for each antenna ID, and application extract them
+	 * in user space.
+	 */
+	QCA_WLAN_VENDOR_ATTR_CHAIN_EVM = 41,
 
 	/* keep last */
 	QCA_WLAN_VENDOR_ATTR_AFTER_LAST,