diff --git a/.gitignore b/.gitignore
index 187e79cd..9729c46b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ composer.lock
 build
 coverage.xml
 .phpunit.result.cache
+.idea
diff --git a/config/config.php b/config/config.php
index f83234d1..2f25c059 100644
--- a/config/config.php
+++ b/config/config.php
@@ -11,6 +11,17 @@
 
 return [
 
+    /*
+    |--------------------------------------------------------------------------
+    | JWT Authentication Key
+    |--------------------------------------------------------------------------
+    |
+    | You can define a specific key to return user data from the JWT
+    |
+    */
+
+    'identifier' => env('JWT_IDENTIFIER', 'sub'),
+
     /*
     |--------------------------------------------------------------------------
     | JWT Authentication Secret
diff --git a/src/JWT.php b/src/JWT.php
index a958071c..a7074db6 100644
--- a/src/JWT.php
+++ b/src/JWT.php
@@ -250,7 +250,7 @@ protected function getClaimsArray(JWTSubject $subject)
     protected function getClaimsForSubject(JWTSubject $subject)
     {
         return array_merge([
-            'sub' => $subject->getJWTIdentifier(),
+            config('jwt.identifier') => $subject->getJWTIdentifier(),
         ], $this->lockSubject ? ['prv' => $this->hashSubjectModel($subject)] : []);
     }
 
diff --git a/src/JWTAuth.php b/src/JWTAuth.php
index e8ab7272..bc65b3b5 100644
--- a/src/JWTAuth.php
+++ b/src/JWTAuth.php
@@ -60,7 +60,7 @@ public function attempt(array $credentials)
      */
     public function authenticate()
     {
-        $id = $this->getPayload()->get('sub');
+        $id = $this->getPayload()->get(config('jwt.identifier'));
 
         if (! $this->auth->byId($id)) {
             return false;
diff --git a/src/JWTGuard.php b/src/JWTGuard.php
index 31957072..94ac8cdc 100644
--- a/src/JWTGuard.php
+++ b/src/JWTGuard.php
@@ -78,7 +78,7 @@ public function user()
             ($payload = $this->jwt->check(true)) &&
             $this->validateSubject()
         ) {
-            return $this->user = $this->provider->retrieveById($payload['sub']);
+            return $this->user = $this->provider->retrieveById($payload[config('jwt.identifier')]);
         }
     }