diff --git a/lib/hx509/Makefile.am b/lib/hx509/Makefile.am
index 999cee7b1..cd2476218 100644
--- a/lib/hx509/Makefile.am
+++ b/lib/hx509/Makefile.am
@@ -138,6 +138,7 @@ CLEANFILES = $(BUILT_SOURCES) \
 	request.out \
 	sd.data sd.data.out \
 	ev.data ev.data.out \
+	cert-proxy.der cert-ca.der cert-ee.der pkcs10-request.der \
 	random-data \
 	test