diff --git a/types/pouchdb-core/index.d.ts b/types/pouchdb-core/index.d.ts
index eccc2e00fb..556fa71b5b 100644
--- a/types/pouchdb-core/index.d.ts
+++ b/types/pouchdb-core/index.d.ts
@@ -298,7 +298,7 @@ declare namespace PouchDB {
 
         interface ChangesResponseChange<Content extends Core.Encodable> {
             id: string;
-            seq: number;
+            seq: number | string;
             changes: { rev: string }[];
             deleted?: boolean;
             doc?: ExistingDocument<Content & ChangesMeta>;
@@ -306,7 +306,7 @@ declare namespace PouchDB {
 
         interface ChangesResponse<Content extends Core.Encodable> {
             status: string;
-            last_seq: number;
+            last_seq: number | string;
             results: ChangesResponseChange<Content>[];
         }
 
diff --git a/types/pouchdb-core/pouchdb-core-tests.ts b/types/pouchdb-core/pouchdb-core-tests.ts
index a2593ce291..ba06de7608 100644
--- a/types/pouchdb-core/pouchdb-core-tests.ts
+++ b/types/pouchdb-core/pouchdb-core-tests.ts
@@ -162,7 +162,8 @@ function testChanges() {
     })
     .on('change', (change) => {
         let _id: string = change.id;
-        let _seq: number = change.seq;
+        let _seq: number = change.seq as number;
+        let _seq_couch20: string = change.seq as string;
         let _changes: { rev: string }[] = change.changes;
         let _foo: string = change.doc!.foo;
         let _deleted: boolean | undefined = change.doc!._deleted;
@@ -170,11 +171,13 @@ function testChanges() {
     })
     .on('complete', (info) => {
         let _status: string = info.status;
-        let _last_req: number = info.last_seq;
+        let _last_req: number = info.last_seq as number;
+        let _last_seq_couch20: string = info.last_seq as string;
         let change = info.results[0];
 
         let _id: string = change.id;
-        let _seq: number = change.seq;
+        let _seq: number = change.seq as number;
+        let _seq_couch20: string = change.seq as string;
         let _changes: { rev: string }[] = change.changes;
         let _deleted: boolean | undefined = change.doc!._deleted;
         let _attachments: PouchDB.Core.Attachments | undefined = change.doc!._attachments;