diff --git a/wifibroadcast.hpp b/wifibroadcast.hpp
index e396c5f..a4bf762 100644
--- a/wifibroadcast.hpp
+++ b/wifibroadcast.hpp
@@ -57,8 +57,15 @@ extern string string_format(const char *format, ...);
 #define IEEE80211_RADIOTAP_MCS_SGI              0x04
 #define IEEE80211_RADIOTAP_MCS_FMT_GF           0x08
 
-#define MCS_KNOWN (IEEE80211_RADIOTAP_MCS_HAVE_MCS | IEEE80211_RADIOTAP_MCS_HAVE_BW | IEEE80211_RADIOTAP_MCS_HAVE_GI) // | IEEE80211_RADIOTAP_MCS_HAVE_FMT)
-#define MCS_FLAGS (IEEE80211_RADIOTAP_MCS_BW_40 | IEEE80211_RADIOTAP_MCS_SGI) // | IEEE80211_RADIOTAP_MCS_FMT_GF)
+#define IEEE80211_RADIOTAP_MCS_HAVE_STBC  0x20
+#define	IEEE80211_RADIOTAP_MCS_STBC_MASK  0x60
+#define	IEEE80211_RADIOTAP_MCS_STBC_1  1
+#define	IEEE80211_RADIOTAP_MCS_STBC_2  2
+#define	IEEE80211_RADIOTAP_MCS_STBC_3  3
+#define	IEEE80211_RADIOTAP_MCS_STBC_SHIFT 5
+
+#define MCS_KNOWN (IEEE80211_RADIOTAP_MCS_HAVE_MCS | IEEE80211_RADIOTAP_MCS_HAVE_BW | IEEE80211_RADIOTAP_MCS_HAVE_GI | IEEE80211_RADIOTAP_MCS_HAVE_STBC) // | IEEE80211_RADIOTAP_MCS_HAVE_FMT)
+#define MCS_FLAGS (IEEE80211_RADIOTAP_MCS_BW_40 | IEEE80211_RADIOTAP_MCS_SGI | (IEEE80211_RADIOTAP_MCS_STBC_1 << IEEE80211_RADIOTAP_MCS_STBC_SHIFT) ) // | IEEE80211_RADIOTAP_MCS_FMT_GF)
 
 static const uint8_t radiotap_header[]  __attribute__((unused)) = {
     0x00, 0x00, // <-- radiotap version