diff --git a/Polyhedron/demo/Polyhedron/polyhedron_demo_macros.cmake b/Polyhedron/demo/Polyhedron/polyhedron_demo_macros.cmake
index 6bdda967ab8..2fd16a15c20 100644
--- a/Polyhedron/demo/Polyhedron/polyhedron_demo_macros.cmake
+++ b/Polyhedron/demo/Polyhedron/polyhedron_demo_macros.cmake
@@ -19,7 +19,7 @@ include(${CGAL_MODULES_DIR}/CGAL_add_test.cmake)
       set(moc_file_name "")
     else()
       set(moc_file_name ${plugin_implementation_base_name}.moc )
-      qt6_generate_moc( ${plugin_implementation_base_name}.cpp "${CMAKE_CURRENT_BINARY_DIR}/${moc_file_name}" )
+      qt6_generate_moc( ${plugin_implementation_base_name}.cpp "${CMAKE_CURRENT_BINARY_DIR}/${moc_file_name}" TARGET ${plugin_name})
       add_file_dependencies( ${moc_file_name} "${CMAKE_CURRENT_SOURCE_DIR}/${plugin_implementation_base_name}.cpp" )
     endif()