diff --git a/test/types/discriminator.test.ts b/test/types/discriminator.test.ts
index 052e3c3ba3c..1f32fd1149b 100644
--- a/test/types/discriminator.test.ts
+++ b/test/types/discriminator.test.ts
@@ -18,6 +18,12 @@ const doc: IDiscriminatorTest = new Disc({ name: 'foo', email: 'hi' });
 doc.name = 'bar';
 doc.email = 'hello';
 
+const Disc2 = Base.discriminator<IDiscriminatorTest>(
+  'Disc2',
+  new Schema({ email: { type: String } }),
+  { value: 'test', mergeHooks: false }
+);
+
 function test(): void {
   enum CardType {
     Artifact = 'artifact',
diff --git a/types/models.d.ts b/types/models.d.ts
index d3cbbcf1338..1f4cd3cc2ce 100644
--- a/types/models.d.ts
+++ b/types/models.d.ts
@@ -1,10 +1,17 @@
 declare module 'mongoose' {
   import mongodb = require('mongodb');
 
+  export interface DiscriminatorOptions {
+    value?: string | number | ObjectId;
+    clone?: boolean;
+    overwriteModels?: boolean;
+    mergeHooks?: boolean;
+  }
+
   export interface AcceptsDiscriminator {
     /** Adds a discriminator type. */
-    discriminator<D>(name: string | number, schema: Schema, value?: string | number | ObjectId): Model<D>;
-    discriminator<T, U>(name: string | number, schema: Schema<T, U>, value?: string | number | ObjectId): U;
+    discriminator<D>(name: string | number, schema: Schema, value?: string | number | ObjectId | DiscriminatorOptions): Model<D>;
+    discriminator<T, U>(name: string | number, schema: Schema<T, U>, value?: string | number | ObjectId | DiscriminatorOptions): U;
   }
 
   interface MongooseBulkWriteOptions {