--- a/src/devices/wifi/propagation-delay-model.cc	Thu Oct 11 15:43:47 2007 +0200
+++ b/src/devices/wifi/propagation-delay-model.cc	Thu Oct 11 16:16:14 2007 +0200
@@ -15,7 +15,8 @@
 ("PropagationDelayModelType",
  "The type of propagation delay model to use.",
  CONSTANT_SPEED, "ConstantSpeed",
- RANDOM, "Random");
+ RANDOM, "Random",
+ 0, (void*)0);
 
 static NumericDefaultValue<double> g_speed
 ("PropagationDelayConstantSpeed",