diff --git a/cartridges/meson.build b/cartridges/meson.build
index 61da5c3..3901c67 100644
--- a/cartridges/meson.build
+++ b/cartridges/meson.build
@@ -1,4 +1,4 @@
-moduledir = join_paths(python_dir, 'cartridges')
+moduledir = python_dir / 'cartridges'
 
 configure_file(
   input: 'cartridges.in',