diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 499b58279c..b379959eb4 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -1073,6 +1073,9 @@ x509_crt_parse_cn_inet_pton:"10.10..10.10.":"":0
 X509 CRT parse CN: IPv4 overlarge octet 256
 x509_crt_parse_cn_inet_pton:"10.256.10.10":"":0
 
+X509 CRT parse CN: IPv4 overlarge octet 999
+x509_crt_parse_cn_inet_pton:"10.10.10.999":"":0
+
 X509 CRT parse CN: IPv4 overlarge octet 1000
 x509_crt_parse_cn_inet_pton:"10.1000.10.10":"":0