diff --git a/ProcessLib/HT/HTFEM.h b/ProcessLib/HT/HTFEM.h
index 6475ea65d75bbd55ede2e40f5a85f9178558076b..86903ca1f9f3f625ff92dc4bffe490c12cab0315 100644
--- a/ProcessLib/HT/HTFEM.h
+++ b/ProcessLib/HT/HTFEM.h
@@ -354,6 +354,12 @@ protected:
 
         return cache;
     }
+
+protected:
+    static const int pressure_index = ShapeFunction::NPOINTS;
+    static const int pressure_size = ShapeFunction::NPOINTS;
+    static const int temperature_index = 0;
+    static const int temperature_size = ShapeFunction::NPOINTS;
 };
 
 }  // namespace HT