diff --git a/aman/sys/Worker.py b/aman/sys/Worker.py
index b11a8c4..8a923fa 100644
--- a/aman/sys/Worker.py
+++ b/aman/sys/Worker.py
@@ -109,7 +109,8 @@ class Worker(Thread):
                 acoConfig = Configuration(constraints = self.SequencingConfiguration, nav = self.Configuration.GngData,
                                           earliest = earliestArrivalTime, weather = self.WeatherModel,
                                           preceeding = None if 0 == len(preceedingInbounds) else preceedingInbounds,
-                                          ants = 5 * len(relevantInbounds), generations = 5 * len(relevantInbounds))
+                                          ants = 5 * len(relevantInbounds), generations = 5 * len(relevantInbounds),
+                                          maxDelayMay=self.Configuration.MaxDelayMay)
 
                 # perform the ACO run
                 aco = Colony(relevantInbounds, acoConfig)