diff --git a/lib/hx509/test_ca.in b/lib/hx509/test_ca.in
index b7e9cf769..a83d5fb22 100644
--- a/lib/hx509/test_ca.in
+++ b/lib/hx509/test_ca.in
@@ -116,13 +116,21 @@ ${hxtool} issue-certificate \
 	  --req="pkcs10-request.der" \
 	  --certificate="FILE:cert-ee.pem" || exit 1
 
+echo "issue certificate (email, null subject DN)"
+${hxtool} issue-certificate \
+	  --ca-certificate=FILE:$srcdir/data/ca.crt,$srcdir/data/ca.key \
+	  --subject="" \
+          --email="lha@test.h5l.se" \
+	  --req="pkcs10-request.der" \
+	  --certificate="FILE:cert-null.pem" || exit 1
+
 echo "issue certificate (jabber)"
 ${hxtool} issue-certificate \
 	  --ca-certificate=FILE:$srcdir/data/ca.crt,$srcdir/data/ca.key \
 	  --subject="cn=foo" \
           --jid="lha@test.h5l.se" \
 	  --req="pkcs10-request.der" \
-	  --certificate="FILE:cert-jabber.pem" || exit 1
+	  --certificate="FILE:cert-ee.pem" || exit 1
 
 echo "issue self-signed cert"
 ${hxtool} issue-certificate \