diff --git a/tests/complex/traci/misc/signature/runner.py b/tests/complex/traci/misc/signature/runner.py
index 8785a4165119..9423fde74fbf 100755
--- a/tests/complex/traci/misc/signature/runner.py
+++ b/tests/complex/traci/misc/signature/runner.py
@@ -52,7 +52,8 @@ def libsumo(): return None
     try:
         traci.start([sumolib.checkBinary("sumo"), "-c", "sumo.sumocfg"])
         traci.simulationStep()
-        traci.vehicle.setLaneChangeMode("horiz", lcm=0)
+        if not traci.isLibtraci():
+            traci.vehicle.setLaneChangeMode("horiz", lcm=0)
         traci.vehicle.setParameter(objectID="horiz", key="blub", value="blubber")
         traci.vehicle.setParameter(objID="horiz", key="blub", value="blubber")
         traci.vehicle.setParameter(objectID="horiz", param="blub", value="blubber")