diff --git a/cmake/BioDynaMo.cmake b/cmake/BioDynaMo.cmake
index b2d1f1bb7..47ceade8d 100644
--- a/cmake/BioDynaMo.cmake
+++ b/cmake/BioDynaMo.cmake
@@ -118,7 +118,7 @@ function(build_shared_library TARGET)
 
 
     if (runtime_cxxmodules)
-      set(CLING_MODULEMAP_FILES "$ENV{${CMAKE_BINARY_DIR}/include/module.modulemap}")
+      set(MODULEMAP "--moduleMapFile=${CMAKE_BINARY_DIR}/include/module.modulemap")
     endif()
 
     if (NOT ${TARGET} STREQUAL "biodynamo")