diff --git a/wrap/igl/smooth_field.h b/wrap/igl/smooth_field.h
index 1cd942d3..34e514ca 100644
--- a/wrap/igl/smooth_field.h
+++ b/wrap/igl/smooth_field.h
@@ -34,10 +34,14 @@
 #include <vcg/complex/algorithms/mesh_to_matrix.h>
 
 //igl related stuff
+
 #include <igl/n_polyvector.h>
 #include <igl/principal_curvature.h>
 #include <igl/igl_inline.h>
+
+#ifdef COMISO_FIELD
 #include <igl/copyleft/comiso/nrosy.h>
+#endif
 
 namespace vcg {
 namespace tri {
@@ -228,7 +232,7 @@ class FieldSmoother
                           ScalarType alpha_soft,
                           int Ndir)
     {
-
+#ifdef COMISO_FIELD
         assert((Ndir==2)||(Ndir==4));
         Eigen::MatrixXi F;
         Eigen::MatrixXd V;
@@ -258,6 +262,9 @@ class FieldSmoother
             mesh.face[i].PD1()=dir1*Norm1;
             mesh.face[i].PD2()=dir2*Norm2;
         }
+#else
+        assert(0);
+#endif
     }
 
     static void SmoothNPoly(MeshType &mesh,
@@ -488,6 +495,7 @@ public:
 //        if ((SParam.alpha_curv>0)||
 //             (SParam.sharp_thr>0)||
 //             (SParam.curv_thr>0))
+
         InitByCurvature(mesh,SParam.curvRing);
 
         SelectConstraints(mesh,SParam);