diff --git a/lib/dns/rdata.c b/lib/dns/rdata.c
index c8453aae5c..7a281c2ef7 100644
--- a/lib/dns/rdata.c
+++ b/lib/dns/rdata.c
@@ -1286,7 +1286,7 @@ dns_rdata_checknames(dns_rdata_t *rdata, const dns_name_t *owner,
 unsigned int
 dns_rdatatype_attributes(dns_rdatatype_t type) {
 	RDATATYPE_ATTRIBUTE_SW
-	if (type >= (dns_rdatatype_t)128 && type < (dns_rdatatype_t)255) {
+	if (type >= (dns_rdatatype_t)128 && type <= (dns_rdatatype_t)255) {
 		return (DNS_RDATATYPEATTR_UNKNOWN | DNS_RDATATYPEATTR_META);
 	}
 	return (DNS_RDATATYPEATTR_UNKNOWN);