diff --git a/make/topdir.mk b/make/topdir.mk
index a6f7f4dd..dfaeaa63 100644
--- a/make/topdir.mk
+++ b/make/topdir.mk
@@ -152,5 +152,5 @@ prefix.done:
 	touch $@
 
 echo-prereq-build:
-	@python $(MOD_SCRIPT_DIR)/projects.py $(PROJECTS_PY_EXTRA_ARGS) required-pkg $(RPM_PROJECT)
+	@python $(MOD_SCRIPT_DIR)/projects.py --topdir . $(PROJECTS_PY_EXTRA_ARGS) required-pkg $(RPM_PROJECT)