diff --git a/core/utils/CMakeLists.txt b/core/utils/CMakeLists.txt
index 5d451fb65ec33e2fed0bfbca092f7b98ec56285b..4f2eda291c0919fb5e1f3e8670c0121a814ee043 100644
--- a/core/utils/CMakeLists.txt
+++ b/core/utils/CMakeLists.txt
@@ -35,8 +35,8 @@ add_custom_command(TARGET rootcling POST_BUILD
                    COMMAND ln -f rootcling rootcint
                    COMMAND ln -f rootcling genreflex
                    WORKING_DIRECTORY ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
-set_directory_properties(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/rootcint)
-set_directory_properties(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/genreflex)
+set_directory_properties(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES 
+                         "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/rootcint;${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/genreflex")
 
 install(PROGRAMS  ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/rootcint
                   ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/genreflex