diff --git a/pkg/util/pki/internal/dn_test.go b/pkg/util/pki/internal/dn_test.go
index d59954cc8..5fd50baa9 100644
--- a/pkg/util/pki/internal/dn_test.go
+++ b/pkg/util/pki/internal/dn_test.go
@@ -161,6 +161,7 @@ func TestErrorDNParsing(t *testing.T) {
 		`1.3.6.1.4.1.1466.0=test;`:  "DN ended with incomplete type, value pair",
 		"1.3.6.1.4.1.1466.0=test+,": "incomplete type, value pair",
 		"1=#0402486":                "failed to decode hex-encoded string: encoding/hex: odd length hex string",
+		"DF=#6666666666665006838820013100000746939546349182108463491821809FBFFFFFFFFF": "failed to unmarshal hex-encoded string: asn1: syntax error: data truncated",
 	}
 
 	for test, answer := range testcases {