diff --git a/here_location_services/tour_planning_api.py b/here_location_services/tour_planning_api.py
index 2db8276..6e13bb4 100644
--- a/here_location_services/tour_planning_api.py
+++ b/here_location_services/tour_planning_api.py
@@ -72,7 +72,7 @@ def solve_tour_planning(
         if optimization_traffic:
             data["configuration"]["optimizations"]["traffic"] = optimization_traffic
 
-        if optimization_traffic:
+        if optimization_waiting_time:
             data["configuration"]["optimizations"]["waitingTime"] = optimization_waiting_time
 
         data["fleet"] = vars(fleet)