diff --git a/include/wifi.h b/include/wifi.h
index 62d55fb..9781254 100644
--- a/include/wifi.h
+++ b/include/wifi.h
@@ -1028,7 +1028,9 @@ typedef enum _HT_CAP_AMPDU_DENSITY {
  * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2)
  */
 #define IEEE80211_MIN_AMPDU_BUF 0x8
-#define IEEE80211_MAX_AMPDU_BUF 0x40
+#ifndef IEEE80211_MAX_AMPDU_BUF
+    #define IEEE80211_MAX_AMPDU_BUF 0x40
+#endif
 
 
 /* Spatial Multiplexing Power Save Modes */