diff --git a/cmake/CheckDGtalOptionalDependencies.cmake b/cmake/CheckDGtalOptionalDependencies.cmake
index 6e715034dc..0cb6632281 100644
--- a/cmake/CheckDGtalOptionalDependencies.cmake
+++ b/cmake/CheckDGtalOptionalDependencies.cmake
@@ -421,6 +421,7 @@ if(WITH_LIBIGL)
     message(FATAL_ERROR "LIBIGL requires CGAL. Please if the `WITH_CGAL=true` cmake flag.")
   endif()
   include(cmake/deps/libigl.cmake)
+  target_compile_definitions(DGtal PUBLIC -DWITH_LIBIGL)
   set(DGtalLibDependencies ${DGtalLibDependencies} igl::core)
 endif()