diff --git a/sys/net80211/ieee80211_radiotap.h b/sys/net80211/ieee80211_radiotap.h
--- a/sys/net80211/ieee80211_radiotap.h
+++ b/sys/net80211/ieee80211_radiotap.h
@@ -427,6 +427,7 @@
 /* #define	IEEE80211_RADIOTAP_HE_DATA3_STBC		0x8000 */
 
 #define	IEEE80211_RADIOTAP_HE_DATA4_SU_MU_SPTL_REUSE		0x000F
+#define	IEEE80211_RADIOTAP_HE_DATA4_MU_STA_ID			0x7FF0
 #define	IEEE80211_RADIOTAP_HE_DATA4_TB_SPTL_REUSE1		0x000F
 #define	IEEE80211_RADIOTAP_HE_DATA4_TB_SPTL_REUSE2		0x00F0
 #define	IEEE80211_RADIOTAP_HE_DATA4_TB_SPTL_REUSE3		0x0F00