diff -r 01fcacb5eedf -r 243b71de25a0 src/wifi/model/wifi-mac.cc
--- a/src/wifi/model/wifi-mac.cc	Wed Sep 02 16:37:05 2015 -0700
+++ b/src/wifi/model/wifi-mac.cc	Thu Sep 03 22:16:49 2015 +0200
@@ -314,6 +314,9 @@
     case WIFI_PHY_STANDARD_80211n_5GHZ:
       Configure80211n_5Ghz ();
       break;
+    case WIFI_PHY_STANDARD_80211ac:
+      Configure80211ac ();
+      break;
     default:
       NS_ASSERT (false);
       break;
@@ -395,6 +398,12 @@
 }
 
 void
+WifiMac::Configure80211ac (void)
+{
+  Configure80211n_5Ghz ();
+}
+
+void
 WifiMac::ConfigureDcf (Ptr<Dcf> dcf, uint32_t cwmin, uint32_t cwmax, enum AcIndex ac)
 {
   /* see IEE802.11 section 7.3.2.29 */