diff --git a/Makefile b/Makefile
index 3138b3da..d1389e1e 100644
--- a/Makefile
+++ b/Makefile
@@ -46,9 +46,12 @@ cleandeb:
 	rm -f debian/*.debhelper debian/{files,substvars}
 	rm -f configure-stamp build-stamp
 
-config:
+config:	MANIFEST
 	$(PYTHON) setup.py config -lcrypto
 
+MANIFEST: MANIFEST.in setup.py
+	$(PYTHON) setup.py sdist --manifest-only
+
 locale:
 	$(MAKE) -C po