diff --git a/Isosurfacing_3/examples/Isosurfacing_3/CMakeLists.txt b/Isosurfacing_3/examples/Isosurfacing_3/CMakeLists.txt
index cdce4b38cf4..f4b1cf4cea6 100644
--- a/Isosurfacing_3/examples/Isosurfacing_3/CMakeLists.txt
+++ b/Isosurfacing_3/examples/Isosurfacing_3/CMakeLists.txt
@@ -41,10 +41,10 @@ if(TARGET CGAL::TBB_support)
   target_link_libraries(marching_cubes_inrimage PRIVATE CGAL::TBB_support)
 
   if(TARGET CGAL::Eigen3_support)
-	target_link_libraries(dual_contouring_cartesian_grid PRIVATE CGAL::TBB_support)
-	target_link_libraries(dual_contouring_mesh_offset PRIVATE CGAL::TBB_support)
-	target_link_libraries(dual_contouring_octree PRIVATE CGAL::TBB_support)
-	target_link_libraries(all_cartesian_cube PRIVATE CGAL::TBB_support)
-	target_link_libraries(dual_contouring_implicit_iwp PRIVATE CGAL::TBB_support)
+    target_link_libraries(dual_contouring_cartesian_grid PRIVATE CGAL::TBB_support)
+    target_link_libraries(dual_contouring_mesh_offset PRIVATE CGAL::TBB_support)
+    target_link_libraries(dual_contouring_octree PRIVATE CGAL::TBB_support)
+    target_link_libraries(all_cartesian_cube PRIVATE CGAL::TBB_support)
+    target_link_libraries(dual_contouring_implicit_iwp PRIVATE CGAL::TBB_support)
   endif()
 endif()