diff --git a/make/py-topdir.mk b/make/py-topdir.mk
index a58e1207..acbcb8aa 100644
--- a/make/py-topdir.mk
+++ b/make/py-topdir.mk
@@ -1,10 +1,10 @@
-include $(JWBDIR)/make/ldlibpath.mk
+include $(JWBDIR)/make/projects.mk
 
 TD_GENERATE_FILES           += pyproject.toml
 
 PY_CHECK_EXCLUDE            ?=
 
-MYPY_CONFIG_PATH             = $(subst :,:$$MYPY_CONFIG_FILE_DIR/,:$(PYTHONPATH))
+MYPY_CONFIG_PATH             = $(shell $(JW_PKG_PY) --topdir-format relative projects pythonpath --prefix '$$MYPY_CONFIG_FILE_DIR/' $(PROJECT))
 MYPY_PATH_DIRECTIVE          = mypy_path = "$(MYPY_CONFIG_PATH)"
 
 ifndef PY_CHECK_ROOTS