diff --git a/client/diagnostic.c b/client/diagnostic.c
index 58c646d7..9e255918 100644
--- a/client/diagnostic.c
+++ b/client/diagnostic.c
@@ -92,6 +92,7 @@ static const struct diagnostic_dict_mapping diagnostic_mapping[] = {
 	{ "RxMCS", 'y' },
 	{ "TxMCS", 'y' },
 	{ "Frequency", 'u' },
+	{ "Security", 's' },
 	{ NULL }
 };