diff --git a/ProcessLib/HT/HTProcess.cpp b/ProcessLib/HT/HTProcess.cpp
index dc179be6c366fcf733e17870858f4cc5aaddd98b..a80ff47d368d38e7ac37cfc6537e2d0ea7c1a6a8 100644
--- a/ProcessLib/HT/HTProcess.cpp
+++ b/ProcessLib/HT/HTProcess.cpp
@@ -13,11 +13,10 @@
 
 #include "NumLib/DOF/DOFTableUtil.h"
 #include "NumLib/DOF/LocalToGlobalIndexMap.h"
-
+#include "ProcessLib/SurfaceFlux/SurfaceFluxData.h"
 #include "ProcessLib/Utils/CreateLocalAssemblers.h"
 
 #include "HTMaterialProperties.h"
-
 #include "MonolithicHTFEM.h"
 #include "StaggeredHTFEM.h"
 
diff --git a/ProcessLib/HT/HTProcess.h b/ProcessLib/HT/HTProcess.h
index b9f74a6b9bd4c892c25dee614f54fa8a453216cd..b4c9038748d0d619157723e9864c14eb0c0bf49e 100644
--- a/ProcessLib/HT/HTProcess.h
+++ b/ProcessLib/HT/HTProcess.h
@@ -11,8 +11,6 @@
 
 #include <array>
 
-#include "NumLib/Extrapolation/LocalLinearLeastSquaresExtrapolator.h"
-#include "ProcessLib/SurfaceFlux/SurfaceFluxData.h"
 #include "ProcessLib/Process.h"
 
 namespace NumLib
@@ -22,6 +20,8 @@ class LocalToGlobalIndexMap;
 
 namespace ProcessLib
 {
+struct SurfaceFluxData;
+
 namespace HT
 {
 class HTLocalAssemblerInterface;