diff --git a/Makefile b/Makefile
index b07baf6..6b36c88 100644
--- a/Makefile
+++ b/Makefile
@@ -41,5 +41,6 @@ clean:
 	(cd dom0/restore && make clean)
 	(cd dom0/qmemman && make clean)
 	(cd common && make clean)
+	(cd u2mfn && make clean)
 	make -C qrexec clean
 	make -C vchan clean