diff --git a/docs/API.md b/docs/API.md
index c506600..48cd708 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -84,6 +84,7 @@ Returns a `Client` instance and perform login.
  * version : 1.8 or 1.9 or false (to auto-negotiate): default to 1.8
  * customPackets (optional) : an object index by version/state/direction/name, see client_custom_packet for an example
  * hideErrors : do not display errors, default to false
+ * skipValidation : do not try to validate given session, defaults to false
 
 ## mc.Client(isServer,version,[customPackets])
 
diff --git a/src/client/auth.js b/src/client/auth.js
index c618ad8..ab02e96 100644
--- a/src/client/auth.js
+++ b/src/client/auth.js
@@ -3,6 +3,7 @@ const UUID = require('uuid-1345')
 
 module.exports = function (client, options) {
   const clientToken = options.clientToken || (options.session && options.session.clientToken) || UUID.v4().toString()
+  const skipValidation = false || options.skipValidation
   options.accessToken = null
   options.haveCredentials = options.password != null || (clientToken != null && options.session != null)
 
@@ -21,23 +22,25 @@ module.exports = function (client, options) {
     }
 
     if (options.session) {
-      yggdrasil.validate(options.session.accessToken, function (err) {
-        if (!err) { cb(null, options.session) } else {
-          yggdrasil.refresh(options.session.accessToken, options.session.clientToken, function (err, accessToken, data) {
-            if (!err) {
-              cb(null, data)
-            } else if (options.username && options.password) {
-              yggdrasil.auth({
-                user: options.username,
-                pass: options.password,
-                token: clientToken
-              }, cb)
-            } else {
-              cb(err, data)
-            }
-          })
-        }
-      })
+      if (!skipValidation) {
+        yggdrasil.validate(options.session.accessToken, function (err) {
+          if (!err) { cb(null, options.session) } else {
+            yggdrasil.refresh(options.session.accessToken, options.session.clientToken, function (err, accessToken, data) {
+              if (!err) {
+                cb(null, data)
+              } else if (options.username && options.password) {
+                yggdrasil.auth({
+                  user: options.username,
+                  pass: options.password,
+                  token: clientToken
+                }, cb)
+              } else {
+                cb(err, data)
+              }
+            })
+          }
+        })
+      }
     } else {
       yggdrasil.auth({
         user: options.username,
diff --git a/src/index.d.ts b/src/index.d.ts
index 173c32b..3d0a87d 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -38,6 +38,7 @@ declare module 'minecraft-protocol' {
 		port?: number
 		username: string
 		version?: string
+		skipValidation?: boolean
 	}
 
 	export class Server extends EventEmitter {