diff --git a/examples/demo/nuxt.config.js b/examples/demo/nuxt.config.js
index b1899a73c..50aa064a6 100644
--- a/examples/demo/nuxt.config.js
+++ b/examples/demo/nuxt.config.js
@@ -33,7 +33,9 @@ module.exports = {
         client_id: 'q8lDHfBLJ-Fsziu7bf351OcYQAIe3UJv'
       },
       facebook: {
-        client_id: '1671464192946675'
+        client_id: '1671464192946675',
+        userinfo_endpoint: 'https://graph.facebook.com/v2.12/me?fields=about,name,picture{url},email,birthday',
+        scope: ['public_profile', 'email', 'user_birthday']
       },
       google: {
         client_id:
diff --git a/lib/auth/providers/_utils.js b/lib/auth/providers/_utils.js
index eed187035..ea401820c 100644
--- a/lib/auth/providers/_utils.js
+++ b/lib/auth/providers/_utils.js
@@ -2,7 +2,7 @@ const axios = require('axios')
 const bodyParser = require('body-parser')
 
 function assignDefaults (strategy, defaults) {
-  Object.assign(strategy, defaults, strategy)
+  Object.assign(strategy, Object.assign({}, defaults, strategy))
 }
 
 function addAuthorize (strategy) {
diff --git a/lib/module.js b/lib/module.js
index 6bb6f70da..32111134c 100644
--- a/lib/module.js
+++ b/lib/module.js
@@ -114,16 +114,16 @@ function processStrategy (strategy, name, ctx) {
     strategy._provider = strategy._name
   }
 
-  // _scheme property
-  if (!strategy._scheme) {
-    strategy._scheme = strategy._name
-  }
-
   // Apply provider
   if (ctx.providers[strategy._provider]) {
     ctx.providers[strategy._provider].call(this, strategy, ctx)
   }
 
+  // _scheme property
+  if (!strategy._scheme) {
+    strategy._scheme = strategy._name
+  }
+
   // Resolve _scheme
   if (SCHEMES.includes(strategy._scheme)) {
     strategy._scheme = `./schemes/${strategy._scheme}.js`