diff --git a/CMakeLists_files.cmake b/CMakeLists_files.cmake
index f5d7a55d5..056e9a166 100644
--- a/CMakeLists_files.cmake
+++ b/CMakeLists_files.cmake
@@ -58,6 +58,7 @@ list (APPEND MAIN_SOURCE_FILES
   opm/grid/cpgpreprocess/facetopology.c
   opm/grid/cpgpreprocess/geometry.c
   opm/grid/cpgpreprocess/preprocess.c
+	opm/grid/cpgpreprocess/make_edge_conformal.cpp
   opm/grid/cpgpreprocess/uniquepoints.c
   opm/grid/UnstructuredGrid.c
   opm/grid/grid_equal.cpp
@@ -250,6 +251,7 @@ list (APPEND PUBLIC_HEADER_FILES
   opm/grid/cpgpreprocess/facetopology.h
   opm/grid/cpgpreprocess/geometry.h
   opm/grid/cpgpreprocess/preprocess.h
+	opm/grid/cpgpreprocess/make_edge_conformal.hpp
   opm/grid/cpgpreprocess/uniquepoints.h
   opm/grid/transmissibility/trans_tpfa.h
   opm/grid/transmissibility/TransTpfa.hpp
diff --git a/opm/grid/cornerpoint_grid.c b/opm/grid/cornerpoint_grid.c
index c8bc322cc..efe434169 100644
--- a/opm/grid/cornerpoint_grid.c
+++ b/opm/grid/cornerpoint_grid.c
@@ -18,6 +18,7 @@
 #include <opm/grid/cornerpoint_grid.h>
 #include <opm/grid/cpgpreprocess/geometry.h>
 #include <opm/grid/cpgpreprocess/preprocess.h>
+#include <opm/grid/cpgpreprocess/make_edge_conformal.hpp>
 #include <opm/grid/UnstructuredGrid.h>
 
 
@@ -175,8 +176,9 @@ create_grid_cornerpoint(const struct grdecl *in, double tol, bool edge_conformal
 
    ok = process_grdecl(in, tol, NULL, &pg, false, edge_conformal);
    if(edge_conformal){
-     //add_cells(&pg);
-     //make edge conformal
+     // if add cells is done one could skip som of the code later
+     add_cells(&pg);
+     make_edge_conformal(&pg);
    }
      
    if (!ok)
diff --git a/opm/grid/cpgpreprocess/make_edge_conformal.cpp b/opm/grid/cpgpreprocess/make_edge_conformal.cpp
index 78954c7c3..d4f7cd8c4 100644
--- a/opm/grid/cpgpreprocess/make_edge_conformal.cpp
+++ b/opm/grid/cpgpreprocess/make_edge_conformal.cpp
@@ -1,3 +1,4 @@
+#include "config.h"
 #include "preprocess.h"
 #include "make_edge_conformal.hpp"
 #include <vector>
@@ -405,7 +406,7 @@ void fix_edges_at_top(const struct processed_grid& grid,
   }
 }//end cell
 
-extern "C" void make_edge_conformal(struct processed_grid* grid){
+void make_edge_conformal(struct processed_grid* grid){
     std::cout << "Fixing edge grid to be edge conformal" << std::endl;
     std::vector<int> nodes;
     std::vector<int> nodePos;
diff --git a/opm/grid/cpgpreprocess/make_edge_conformal.hpp b/opm/grid/cpgpreprocess/make_edge_conformal.hpp
index 857fbee6f..0acf124f2 100644
--- a/opm/grid/cpgpreprocess/make_edge_conformal.hpp
+++ b/opm/grid/cpgpreprocess/make_edge_conformal.hpp
@@ -2,7 +2,6 @@
 #define OPENRS_MAKE_EDGE_CONFORMAL_HEADER
 
 #include "preprocess.h"
-extern "C" {
-    void make_edge_conformal(struct processed_grid* grdecl);
-}
+void make_edge_conformal(struct processed_grid* grdecl);
+
 #endif
diff --git a/opm/grid/cpgpreprocess/preprocess.c b/opm/grid/cpgpreprocess/preprocess.c
index b41a0fb59..c4efe3bac 100644
--- a/opm/grid/cpgpreprocess/preprocess.c
+++ b/opm/grid/cpgpreprocess/preprocess.c
@@ -1104,7 +1104,7 @@ reverse_face_nodes(struct processed_grid *out)
 }
 
 /* ---------------------------------------------------------------------- */
-static void
+void
 add_cells(struct processed_grid *grid)
 /* ---------------------------------------------------------------------- */
 {
diff --git a/opm/grid/cpgpreprocess/preprocess.h b/opm/grid/cpgpreprocess/preprocess.h
index a3b034580..e000bb4a1 100644
--- a/opm/grid/cpgpreprocess/preprocess.h
+++ b/opm/grid/cpgpreprocess/preprocess.h
@@ -156,7 +156,7 @@ extern "C" {
      *                  call to function process_grdecl().
      */
     void free_processed_grid(struct processed_grid *g, bool edge_conformal);
-
+    void add_cells(struct processed_grid *grid);
 #ifdef __cplusplus
 }
 #endif