diff --git a/Makefile.am b/Makefile.am
index 00163d9a8dcb8d785a4cc2a2387de7d2dacc81e0..8953a009afc65c4cd8842e6b42f6558d51e658e0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -29,6 +29,7 @@ $(DEMO).tar.gz: $(DEMO)
 $(DEMO): DEMO
 	mkdir $@ ; cd $@ ; \
 	( cd ../DEMO ; $(TAR) cf - . ) | $(TAR) xf -
+	rm -f $@/src/[0-9]d/Makefile.in
 
 clean-local:
 	-rm -f  $(DEMO).tar.gz