diff --git a/lib/dns/rdata/generic/tlsa_52.c b/lib/dns/rdata/generic/tlsa_52.c
index 1140bc01cd..5aa6ccac56 100644
--- a/lib/dns/rdata/generic/tlsa_52.c
+++ b/lib/dns/rdata/generic/tlsa_52.c
@@ -128,7 +128,8 @@ generic_fromwire_tlsa(ARGS_FROMWIRE) {
 
 	isc_buffer_activeregion(source, &sr);
 
-	if (sr.length < 3) {
+	/* Usage(1), Selector(1), Type(1), Data(1+) */
+	if (sr.length < 4) {
 		return (ISC_R_UNEXPECTEDEND);
 	}