diff --git a/types/lib/errors.d.ts b/types/lib/errors.d.ts
index 91e3f2eea98f..83fbee9edc58 100644
--- a/types/lib/errors.d.ts
+++ b/types/lib/errors.d.ts
@@ -129,6 +129,13 @@ export class ExclusionConstraintError extends DatabaseError {
   constructor(options: { parent?: Error; message?: string; constraint?: string; fields?: string[]; table?: string });
 }
 
+/**
+ * Thrown when attempting to update a stale model instance
+ */
+export class OptimisticLockError extends BaseError {
+  constructor(options: { message?: string, modelName?: string, values?: { [key: string]: any }, where?: { [key: string]: any } });
+}
+
 /**
  * A base class for all connection related errors.
  */
diff --git a/types/test/errors.ts b/types/test/errors.ts
index f0d9b9b7d2d8..3a58ba296232 100644
--- a/types/test/errors.ts
+++ b/types/test/errors.ts
@@ -1,6 +1,7 @@
 // Error === BaseError
 import { BaseError, EmptyResultError, Error, UniqueConstraintError } from 'sequelize';
 import { User } from './models/User';
+import { OptimisticLockError } from '../lib/errors';
 
 async function test() {
     try {
@@ -23,4 +24,16 @@ async function test() {
             console.error('should return emptyresulterror');
         }
     }
+
+    try {
+        const user: User | null = await User.findByPk(1);
+        if (user != null) {
+            user.username = 'foo';
+            user.save();
+        }
+    } catch (e) {
+        if (!(e instanceof OptimisticLockError)) {
+            console.log('should return OptimisticLockError');
+        }
+    }
 }