diff --git a/Mesh_3/examples/Mesh_3/CMakeLists.txt b/Mesh_3/examples/Mesh_3/CMakeLists.txt
index da5d7e073ce..f1dd4198064 100644
--- a/Mesh_3/examples/Mesh_3/CMakeLists.txt
+++ b/Mesh_3/examples/Mesh_3/CMakeLists.txt
@@ -62,13 +62,13 @@ if ( CGAL_FOUND )
    create_single_source_cgal_program( "mesh_polyhedral_domain.cpp" )
     create_single_source_cgal_program( "mesh_polyhedral_domain_with_features.cpp" )
     if( WITH_CGAL_ImageIO )
-      create_single_source_cgal_program( "mesh_optimization_example.cpp" )
-      create_single_source_cgal_program( "mesh_optimization_lloyd_example.cpp" )
       if( CGAL_ImageIO_USE_ZLIB )
+        create_single_source_cgal_program( "mesh_optimization_example.cpp" )
+        create_single_source_cgal_program( "mesh_optimization_lloyd_example.cpp" )
         create_single_source_cgal_program( "mesh_3D_image.cpp" )
         create_single_source_cgal_program( "mesh_3D_image_variable_size.cpp" )
       else()
-        message( STATUS "NOTICE: The examples mesh_3D_image.cpp and mesh_3D_image_variable_size.cpp need CGAL_ImageIO to be configured with ZLIB support, and will not be compiled." )
+        message( STATUS "NOTICE: The examples mesh_3D_image.cpp, mesh_3D_image_variable_size.cpp, mesh_optimization_example.cpp and mesh_optimization_lloyd_example.cpp need CGAL_ImageIO to be configured with ZLIB support, and will not be compiled." )
       endif()
     else()
       message( STATUS "NOTICE: Some examples need the CGAL_ImageIO library, and will not be compiled." )