diff --git a/lib/dns/rdata/generic/nsec3param_51.c b/lib/dns/rdata/generic/nsec3param_51.c
index a064d43cc6..0ea3103f8e 100644
--- a/lib/dns/rdata/generic/nsec3param_51.c
+++ b/lib/dns/rdata/generic/nsec3param_51.c
@@ -160,7 +160,7 @@ fromwire_nsec3param(ARGS_FROMWIRE) {
 	saltlen = sr.base[4];
 	isc_region_consume(&sr, 5);
 
-	if (sr.length < saltlen) {
+	if (sr.length != saltlen) {
 		RETERR(DNS_R_FORMERR);
 	}
 	isc_region_consume(&sr, saltlen);