diff --git a/src/Unittests/unittests_decimater.cc b/src/Unittests/unittests_decimater.cc
index 37bb307f..ddfb786c 100644
--- a/src/Unittests/unittests_decimater.cc
+++ b/src/Unittests/unittests_decimater.cc
@@ -3,7 +3,6 @@
 #include <Unittests/unittests_common.hh>
 #include <OpenMesh/Tools/Decimater/DecimaterT.hh>
 #include <OpenMesh/Tools/Decimater/ModQuadricT.hh>
-#include <OpenMesh/Tools/Decimater/ModNormalFlippingT.hh>
 
 namespace {
 
@@ -133,38 +132,4 @@ TEST_F(OpenMeshDecimater, DecimateMeshExampleFromDoc) {
 }
 
 
-TEST_F(OpenMeshDecimater, DecimateMeshNormalFlipping) {
-
-  bool ok = OpenMesh::IO::read_mesh(mesh_, "cube1.off");
-
-  ASSERT_TRUE(ok);
-
-  typedef OpenMesh::Decimater::DecimaterT< Mesh >  Decimater;
-  typedef OpenMesh::Decimater::ModNormalFlippingT < Mesh >::Handle HModNormalFlipping;
-  typedef OpenMesh::Decimater::ModQuadricT< Mesh >::Handle HModQuadric;
-
-  Decimater decimaterDBG(mesh_);
-  HModNormalFlipping hModNormalFlippingDGB;
-  decimaterDBG.add( hModNormalFlippingDGB );
-
-  HModQuadric hModQuadricDBG;
-  decimaterDBG.add( hModQuadricDBG );
-  std::cout << decimaterDBG.module( hModQuadricDBG ).name() << std::endl;
-  decimaterDBG.module( hModQuadricDBG ).unset_max_err();
-
-  std::cout << decimaterDBG.module( hModNormalFlippingDGB ).name() << std::endl;
-  decimaterDBG.module( hModNormalFlippingDGB ).set_max_normal_deviation(45.0);
-  EXPECT_TRUE(decimaterDBG.module( hModNormalFlippingDGB ).is_binary()) << "Normal Flipping Module is not binary.";
-
-  decimaterDBG.initialize();
-  size_t removedVertices = 0;
-  removedVertices = decimaterDBG.decimate_to_faces(4500, 9996);
-                    decimaterDBG.mesh().garbage_collection();
-
-  EXPECT_EQ(2526u, removedVertices) << "The number of remove vertices is not correct!";
-  EXPECT_EQ(5000u, mesh_.n_vertices()) << "The number of vertices after decimation is not correct!";
-  EXPECT_EQ(14994u, mesh_.n_edges()) << "The number of edges after decimation is not correct!";
-  EXPECT_EQ(9996u, mesh_.n_faces()) << "The number of faces after decimation is not correct!";
-}
-
 }