diff --git a/types/swagger-express-middleware/index.d.ts b/types/swagger-express-middleware/index.d.ts
index 80d56ae812..4d83cebfb0 100644
--- a/types/swagger-express-middleware/index.d.ts
+++ b/types/swagger-express-middleware/index.d.ts
@@ -40,7 +40,7 @@ declare module "swagger-express-middleware" {
             (apiDefinitionPathOrObject: string | SwaggerObject, appOrRouter: Application | Router, cb: SwaggerMiddlewareConstructorCallback): SwaggerMiddleware;
         }
         interface SwaggerMiddlewareConstructorCallback {
-            (err: any, middleware: SwaggerMiddleware, api: any, parser: any): void;
+            (err: any, middleware: SwaggerMiddleware, api: SwaggerObject, parser: SwaggerParser): void;
         }
 
         export interface SwaggerMiddleware {
@@ -363,6 +363,11 @@ declare module "swagger-express-middleware" {
             externalDocs?: ExternalDocumentationObject
         }
 
+        export interface SwaggerParser {
+            $refs: any
+            schema: SwaggerObject
+        }
+
         type MimeTypes = string[]
 
         export interface InfoObject {
diff --git a/types/swagger-express-middleware/swagger-express-middleware-tests.ts b/types/swagger-express-middleware/swagger-express-middleware-tests.ts
index 8717755725..37bbf66ec7 100644
--- a/types/swagger-express-middleware/swagger-express-middleware-tests.ts
+++ b/types/swagger-express-middleware/swagger-express-middleware-tests.ts
@@ -4,7 +4,9 @@ import SwaggerExpressMiddleware = require("swagger-express-middleware");
 let app = express();
 let router = express.Router();
 
-SwaggerExpressMiddleware("PetStore.yaml", app, (err: any, middleware: SwaggerExpressMiddleware.SwaggerMiddleware, api) => {
+SwaggerExpressMiddleware("PetStore.yaml", app, (err: any, 
+                                                middleware: SwaggerExpressMiddleware.SwaggerMiddleware,
+                                                api: SwaggerExpressMiddleware.SwaggerObject) => {
     let filesOptions: SwaggerExpressMiddleware.FilesOptions = {
         useBasePath: false,
         apiPath: "/api-docs/",