diff --git a/lib/routes.js b/lib/routes.js
index ba65144..3e5ae45 100644
--- a/lib/routes.js
+++ b/lib/routes.js
@@ -169,7 +169,7 @@ function fastifySwagger (fastify, opts, done) {
           reply.send(transformSpecification(rfdc(fastify.swagger()), req, reply))
         }
         : function (req, reply) {
-          reply.send(transformSpecification(fastify.swagger()), req, reply)
+          reply.send(transformSpecification(fastify.swagger(), req, reply))
         }
       : function (req, reply) {
         reply.send(fastify.swagger())
@@ -191,7 +191,7 @@ function fastifySwagger (fastify, opts, done) {
         : function (req, reply) {
           reply
             .type('application/x-yaml')
-            .send(yaml.stringify(transformSpecification(fastify.swagger()), req, reply))
+            .send(yaml.stringify(transformSpecification(fastify.swagger(), req, reply)))
         }
       : function (req, reply) {
         reply
diff --git a/test/transform-swagger.test.js b/test/transform-swagger.test.js
index 6b592c5..2254f88 100644
--- a/test/transform-swagger.test.js
+++ b/test/transform-swagger.test.js
@@ -7,7 +7,7 @@ const fastifySwaggerUi = require('../index')
 const yaml = require('yaml')
 
 test('transformSpecification should modify the json', async (t) => {
-  t.plan(3)
+  t.plan(5)
   const fastify = Fastify()
 
   await fastify.register(fastifySwagger, {
@@ -53,6 +53,8 @@ test('transformSpecification should modify the json', async (t) => {
   await fastify.register(fastifySwaggerUi, {
     transformSpecification: function (swaggerObject, req, reply) {
       t.not(swaggerObject, fastify.swagger())
+      t.ok(req)
+      t.ok(reply)
       swaggerObject.swagger = '2.1'
       return swaggerObject
     }
@@ -70,7 +72,7 @@ test('transformSpecification should modify the json', async (t) => {
 })
 
 test('transformSpecificationClone false should not deepclone fastify.swagger() /1', async (t) => {
-  t.plan(2)
+  t.plan(4)
   const fastify = Fastify()
 
   await fastify.register(fastifySwagger, {
@@ -117,6 +119,8 @@ test('transformSpecificationClone false should not deepclone fastify.swagger() /
     transformSpecificationClone: false,
     transformSpecification: function (swaggerObject, req, reply) {
       t.equal(swaggerObject, fastify.swagger())
+      t.ok(req)
+      t.ok(reply)
       return swaggerObject
     }
   })
@@ -132,7 +136,7 @@ test('transformSpecificationClone false should not deepclone fastify.swagger() /
 })
 
 test('transformSpecification should modify the yaml', async (t) => {
-  t.plan(2)
+  t.plan(4)
   const fastify = Fastify()
 
   await fastify.register(fastifySwagger, {
@@ -178,6 +182,8 @@ test('transformSpecification should modify the yaml', async (t) => {
   await fastify.register(fastifySwaggerUi, {
     transformSpecification: function (swaggerObject, req, reply) {
       swaggerObject.swagger = '2.1'
+      t.ok(req)
+      t.ok(reply)
       return swaggerObject
     }
   })
@@ -195,7 +201,7 @@ test('transformSpecification should modify the yaml', async (t) => {
 })
 
 test('transformSpecificationClone false should not deepclone fastify.swagger() /2', async (t) => {
-  t.plan(2)
+  t.plan(4)
   const fastify = Fastify()
 
   await fastify.register(fastifySwagger, {
@@ -242,6 +248,8 @@ test('transformSpecificationClone false should not deepclone fastify.swagger() /
     transformSpecificationClone: false,
     transformSpecification: function (swaggerObject, req, reply) {
       t.equal(swaggerObject, fastify.swagger())
+      t.ok(req)
+      t.ok(reply)
       return swaggerObject
     }
   })