diff --git a/src/index.d.ts b/src/index.d.ts
index 602a924..c761cda 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -1,6 +1,6 @@
 import { RequestHandler } from "express-serve-static-core";
 import { JSONSchema4, JSONSchema6, JSONSchema7 } from "json-schema";
-import { ErrorObject, Options as AjvOptions } from "ajv";
+import { Ajv, ErrorObject, Options as AjvOptions } from "ajv";
 
 declare module "express-json-validator-middleware" {
 	type OptionKey = "body" | "params" | "query";
@@ -18,6 +18,8 @@ declare module "express-json-validator-middleware" {
 	export class Validator {
 		constructor(options: AjvOptions);
 
+		ajv: Ajv;
+
 		validate(rules: List<ValidateFunction>): RequestHandler;
 	}