diff --git a/ProcessLib/HeatTransportBHE/BHE/CreateFlowAndTemperatureControl.cpp b/ProcessLib/HeatTransportBHE/BHE/CreateFlowAndTemperatureControl.cpp
index 0ea8aad7b2c4e5fb4e0435b7fef7498648455313..f9d2542bcfc6aa455b965e98a6f7e4e7710d9c3b 100644
--- a/ProcessLib/HeatTransportBHE/BHE/CreateFlowAndTemperatureControl.cpp
+++ b/ProcessLib/HeatTransportBHE/BHE/CreateFlowAndTemperatureControl.cpp
@@ -10,7 +10,7 @@
  */
 
 #include "BaseLib/ConfigTree.h"
-#include "BaseLib/Error.h"
+#include "MathLib/InterpolationAlgorithms/PiecewiseLinearInterpolation.h"
 #include "BaseLib/Algorithm.h"
 
 #include "CreateFlowAndTemperatureControl.h"
diff --git a/ProcessLib/HeatTransportBHE/BHE/CreateFlowAndTemperatureControl.h b/ProcessLib/HeatTransportBHE/BHE/CreateFlowAndTemperatureControl.h
index 2696d164c705b96d0c5ade08f8b2bfdfc8515033..b7caf7ccaaa1c68761ebe49b4a936df0729b437b 100644
--- a/ProcessLib/HeatTransportBHE/BHE/CreateFlowAndTemperatureControl.h
+++ b/ProcessLib/HeatTransportBHE/BHE/CreateFlowAndTemperatureControl.h
@@ -33,7 +33,7 @@ namespace HeatTransportBHE
 {
 namespace BHE
 {
-class RefrigerantProperties;
+struct RefrigerantProperties;
 
 FlowAndTemperatureControl createFlowAndTemperatureControl(
     BaseLib::ConfigTree const& config,