diff --git a/Ridges_3/examples/Ridges_3/CMakeLists.txt b/Ridges_3/examples/Ridges_3/CMakeLists.txt
index 6a08efbecdb..8f64be996ba 100644
--- a/Ridges_3/examples/Ridges_3/CMakeLists.txt
+++ b/Ridges_3/examples/Ridges_3/CMakeLists.txt
@@ -19,6 +19,7 @@ if(TARGET CGAL::Eigen3_support)
     target_link_libraries(Ridges_Umbilics_SM PUBLIC CGAL::Eigen3_support)
     create_single_source_cgal_program(Ridges_Umbilics_LCC.cpp)
     target_link_libraries(Ridges_Umbilics_LCC PUBLIC CGAL::Eigen3_support)
+    add_definitions("-DCGAL_USE_BOOST_PROGRAM_OPTIONS")
     if(TARGET Boost::program_options)
       target_link_libraries(Compute_Ridges_Umbilics PRIVATE Boost::program_options)
       target_link_libraries(Ridges_Umbilics_SM PRIVATE Boost::program_options)