diff -r eb0fc97dfd5b -r 527ed7692b84 src/wifi/model/rraa-wifi-manager.cc
--- a/src/wifi/model/rraa-wifi-manager.cc	Sat Sep 05 13:37:30 2015 +0200
+++ b/src/wifi/model/rraa-wifi-manager.cc	Sat Sep 05 15:53:37 2015 +0200
@@ -287,7 +287,7 @@
 {
   RraaWifiRemoteStation *station = (RraaWifiRemoteStation *) st;
   uint32_t channelWidth = GetChannelWidth (station);
-  if (channelWidth >= 40)
+  if (channelWidth > 20 && channelWidth != 22)
     {
       //avoid to use legacy rate adaptation algorithms for IEEE 802.11n/ac
       channelWidth = 20;
@@ -304,7 +304,7 @@
 {
   RraaWifiRemoteStation *station = (RraaWifiRemoteStation *) st;
   uint32_t channelWidth = GetChannelWidth (station);
-  if (channelWidth >= 40)
+  if (channelWidth > 20 && channelWidth != 22)
     {
       //avoid to use legacy rate adaptation algorithms for IEEE 802.11n/ac
       channelWidth = 20;