diff --git a/src/tap-bridge/examples/tap-wifi-virtual-machine.py b/src/tap-bridge/examples/tap-wifi-virtual-machine.py
index ba3fbf4b3c7..bae360362f9 100644
--- a/src/tap-bridge/examples/tap-wifi-virtual-machine.py
+++ b/src/tap-bridge/examples/tap-wifi-virtual-machine.py
@@ -54,7 +54,7 @@ def main(argv):
     #
     # No reason for pesky access points, so we'll use an ad-hoc network.
     #
-    wifiMac = ns.wifi.WifiMacHelper
+    wifiMac = ns.wifi.WifiMacHelper()
     wifiMac.SetType ("ns3::AdhocWifiMac");
 
     #