diff --git a/Makefile b/Makefile
index b3a9abf83..6c8376474 100644
--- a/Makefile
+++ b/Makefile
@@ -83,6 +83,7 @@ export: www
 	$(RSYNC) $(RSYNC_FLAGS) --exclude=".svn/" www/ $(DESTDIR)/
 
 $(DATESTAMP):
+	$(RM) $(wildcard build/.stamp-*)
 	touch $@
 
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