diff --git a/Makefile b/Makefile
index dd85e51a20..feb8010fac 100644
--- a/Makefile
+++ b/Makefile
@@ -961,6 +961,7 @@ clean:
 	$(Q)for dir in . src include/* doc; do rm -f $$dir/*~ $$dir/*.rej $$dir/core; done
 	$(Q)rm -f haproxy-$(VERSION).tar.gz haproxy-$(VERSION)$(SUBVERS)$(EXTRAVERSION).tar.gz
 	$(Q)rm -f haproxy-$(VERSION) haproxy-$(VERSION)$(SUBVERS)$(EXTRAVERSION) nohup.out gmon.out
+	$(Q)rm -f contrib/*/*.[oas] contrib/*/*/*.[oas] contrib/*/*/*/*.[oas]
 	$(Q)rm -f contrib/halog/halog contrib/debug/flags contrib/debug/poll contrib/tcploop/tcploop
 
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