diff --git a/ProcessLib/GroundwaterFlowProcess.h b/ProcessLib/GroundwaterFlowProcess.h
index 1d4e8c58ac4bf1d1ecd0e293be4e2d7e58d80c25..1f9465046e7a8b39fb3634adf19945f19f4edbd8 100644
--- a/ProcessLib/GroundwaterFlowProcess.h
+++ b/ProcessLib/GroundwaterFlowProcess.h
@@ -53,6 +53,14 @@ public:
     {
     }
 
+    void solve()
+    {
+    }
+
+    void post()
+    {
+    }
+
     ~GroundwaterFlowProcess()
     {
     }