diff --git a/FluidDynamics/Components/Machines/test_polynomialFlow.mo b/FluidDynamics/Components/Machines/test_polynomialFlow.mo
index ac84fbc7f32e3c78c8c0bb8368158685cf753a47..5f1441312e360d634feeff13a07c1a24db1c90a8 100644
--- a/FluidDynamics/Components/Machines/test_polynomialFlow.mo
+++ b/FluidDynamics/Components/Machines/test_polynomialFlow.mo
@@ -19,7 +19,8 @@ equation
   head = TAeZoSysPro.FluidDynamics.Components.Machines.BaseClasses.PumpCharacteristics.polynomialFlow(
     V_flow = V_flow,
     V_flow_nominal = V_flow_nominal,
-    head_nominal = head_nominal) ;
+    head_nominal = head_nominal,
+    OrderPolyFitting = 2) ;
 
     
   annotation(