diff --git a/lib/dns/include/dst/dst.h b/lib/dns/include/dst/dst.h
index 32b0742..1924e74 100644
--- a/lib/dns/include/dst/dst.h
+++ b/lib/dns/include/dst/dst.h
@@ -70,8 +70,7 @@ typedef struct dst_context 	dst_context_t;
 #define DST_ALG_HMACSHA512	165	/* XXXMPA */
 #define DST_ALG_INDIRECT	252
 #define DST_ALG_PRIVATE		254
-#define DST_ALG_EXPAND		255
-#define DST_MAX_ALGS		255
+#define DST_MAX_ALGS		256
 
 /*% A buffer of this size is large enough to hold any key */
 #define DST_KEY_MAXSIZE		1280
diff --git a/lib/dns/zone.c b/lib/dns/zone.c
index d9b1841..6d4426a 100644
--- a/lib/dns/zone.c
+++ b/lib/dns/zone.c
@@ -3926,9 +3926,10 @@ compute_tag(dns_name_t *name, dns_rdata_dnskey_t *dnskey, isc_mem_t *mctx,
 			     dns_rdatatype_dnskey, dnskey, &buffer);
 
 	result = dns_dnssec_keyfromrdata(name, &rdata, mctx, &dstkey);
-	if (result == ISC_R_SUCCESS)
+	if (result == ISC_R_SUCCESS) {
 		*tag = dst_key_id(dstkey);
-	dst_key_free(&dstkey);
+		dst_key_free(&dstkey);
+	}
 
 	return (result);
 }
@@ -9441,6 +9442,17 @@ keyfetch_done(isc_task_t *task, isc_event_t *event) {
 
 		dns_keydata_todnskey(&keydata, &dnskey, NULL);
 		result = compute_tag(keyname, &dnskey, mctx, &keytag);
+		if (result != ISC_R_SUCCESS) {
+			/*
+			 * Skip if we cannot compute the key tag.
+			 * This may happen if the algorithm is unsupported
+			 */
+			dns_zone_log(zone, ISC_LOG_ERROR,
+				"Cannot compute tag for key in zone %s: %s "
+				"(skipping)",
+				namebuf, dns_result_totext(result));
+			continue;
+		}
 		RUNTIME_CHECK(result == ISC_R_SUCCESS);
 
 		/*
@@ -9552,6 +9564,17 @@ keyfetch_done(isc_task_t *task, isc_event_t *event) {
 			continue;
 
 		result = compute_tag(keyname, &dnskey, mctx, &keytag);
+		if (result != ISC_R_SUCCESS) {
+			/*
+			 * Skip if we cannot compute the key tag.
+			 * This may happen if the algorithm is unsupported
+			 */
+			dns_zone_log(zone, ISC_LOG_ERROR,
+				"Cannot compute tag for key in zone %s: %s "
+				"(skipping)",
+				namebuf, dns_result_totext(result));
+			continue;
+		}
 		RUNTIME_CHECK(result == ISC_R_SUCCESS);
 
 		revoked = (dnskey.flags & DNS_KEYFLAG_REVOKE);