diff --git a/lib/dns/rdata/in_1/dhcid_49.c b/lib/dns/rdata/in_1/dhcid_49.c
index 7486ca86bd..6049cc5fc5 100644
--- a/lib/dns/rdata/in_1/dhcid_49.c
+++ b/lib/dns/rdata/in_1/dhcid_49.c
@@ -149,6 +149,7 @@ tostruct_in_dhcid(ARGS_TOSTRUCT) {
 	dns_rdata_toregion(rdata, &region);
 
 	dhcid->dhcid = mem_maybedup(mctx, region.base, region.length);
+	dhcid->length = region.length;
 	dhcid->mctx = mctx;
 	return ISC_R_SUCCESS;
 }