diff --git a/src/Entrust/Traits/EntrustPermissionTrait.php b/src/Entrust/Traits/EntrustPermissionTrait.php
index 8c06c261..d2a460f6 100644
--- a/src/Entrust/Traits/EntrustPermissionTrait.php
+++ b/src/Entrust/Traits/EntrustPermissionTrait.php
@@ -19,7 +19,7 @@ trait EntrustPermissionTrait
      */
     public function roles()
     {
-        return $this->belongsToMany(Config::get('entrust.role'), Config::get('entrust.permission_role_table'));
+        return $this->belongsToMany(Config::get('entrust.role'), Config::get('entrust.permission_role_table'), Config::get('entrust.permission_foreign_key'), Config::get('entrust.role_foreign_key'));
     }
 
     /**
diff --git a/src/Entrust/Traits/EntrustRoleTrait.php b/src/Entrust/Traits/EntrustRoleTrait.php
index e7b37189..4e39439a 100644
--- a/src/Entrust/Traits/EntrustRoleTrait.php
+++ b/src/Entrust/Traits/EntrustRoleTrait.php
@@ -18,40 +18,42 @@ trait EntrustRoleTrait
     public function cachedPermissions()
     {
         $rolePrimaryKey = $this->primaryKey;
-        $cacheKey = 'entrust_permissions_for_role_'.$this->$rolePrimaryKey;
-        if(Cache::getStore() instanceof TaggableStore) {
+        $cacheKey = 'entrust_permissions_for_role_' . $this->$rolePrimaryKey;
+        if (Cache::getStore() instanceof TaggableStore) {
             return Cache::tags(Config::get('entrust.permission_role_table'))->remember($cacheKey, Config::get('cache.ttl', 60), function () {
                 return $this->perms()->get();
             });
-        }
-        else return $this->perms()->get();
+        } else return $this->perms()->get();
     }
+
     public function save(array $options = [])
     {   //both inserts and updates
-        if(!parent::save($options)){
+        if (!parent::save($options)) {
             return false;
         }
-        if(Cache::getStore() instanceof TaggableStore) {
+        if (Cache::getStore() instanceof TaggableStore) {
             Cache::tags(Config::get('entrust.permission_role_table'))->flush();
         }
         return true;
     }
+
     public function delete(array $options = [])
     {   //soft or hard
-        if(!parent::delete($options)){
+        if (!parent::delete($options)) {
             return false;
         }
-        if(Cache::getStore() instanceof TaggableStore) {
+        if (Cache::getStore() instanceof TaggableStore) {
             Cache::tags(Config::get('entrust.permission_role_table'))->flush();
         }
         return true;
     }
+
     public function restore()
     {   //soft delete undo's
-        if(!parent::restore()){
+        if (!parent::restore()) {
             return false;
         }
-        if(Cache::getStore() instanceof TaggableStore) {
+        if (Cache::getStore() instanceof TaggableStore) {
             Cache::tags(Config::get('entrust.permission_role_table'))->flush();
         }
         return true;
@@ -64,8 +66,7 @@ public function restore()
      */
     public function users()
     {
-        return $this->belongsToMany(Config::get('auth.providers.users.model'), Config::get('entrust.role_user_table'),Config::get('entrust.role_foreign_key'),Config::get('entrust.user_foreign_key'));
-       // return $this->belongsToMany(Config::get('auth.model'), Config::get('entrust.role_user_table'));
+        return $this->belongsToMany(Config::get('auth.providers.users.model'), Config::get('entrust.role_user_table'), Config::get('entrust.role_foreign_key'), Config::get('entrust.user_foreign_key'));
     }
 
     /**
@@ -90,7 +91,7 @@ public static function boot()
     {
         parent::boot();
 
-        static::deleting(function($role) {
+        static::deleting(function ($role) {
             if (!method_exists(Config::get('entrust.role'), 'bootSoftDeletes')) {
                 $role->users()->sync([]);
                 $role->perms()->sync([]);
@@ -103,8 +104,8 @@ public static function boot()
     /**
      * Checks if the role has a permission by its name.
      *
-     * @param string|array $name       Permission name or array of permission names.
-     * @param bool         $requireAll All permissions in the array are required.
+     * @param string|array $name Permission name or array of permission names.
+     * @param bool $requireAll All permissions in the array are required.
      *
      * @return bool
      */
@@ -151,9 +152,9 @@ public function savePermissions($inputPermissions)
             $this->perms()->detach();
         }
 
-        if(Cache::getStore() instanceof TaggableStore) {
-             Cache::tags(Config::get('entrust.permission_role_table'))->flush();
-         }
+        if (Cache::getStore() instanceof TaggableStore) {
+            Cache::tags(Config::get('entrust.permission_role_table'))->flush();
+        }
     }
 
     /**
diff --git a/src/config/config.php b/src/config/config.php
index 3fff5920..07da1773 100644
--- a/src/config/config.php
+++ b/src/config/config.php
@@ -31,6 +31,17 @@
     */
     'roles_table' => 'roles',
 
+    /*
+    |--------------------------------------------------------------------------
+    | Entrust role foreign key
+    |--------------------------------------------------------------------------
+    |
+    | This is the role foreign key used by Entrust to make a proper
+    | relation between permissions and roles & roles and users
+    |
+    */
+    'role_foreign_key' => 'role_id',
+
     /*
     |--------------------------------------------------------------------------
     | Application User Model
@@ -53,6 +64,28 @@
     */
     'users_table' => 'users',
 
+    /*
+    |--------------------------------------------------------------------------
+    | Entrust role_user Table
+    |--------------------------------------------------------------------------
+    |
+    | This is the role_user table used by Entrust to save assigned roles to the
+    | database.
+    |
+    */
+    'role_user_table' => 'role_user',
+
+    /*
+    |--------------------------------------------------------------------------
+    | Entrust user foreign key
+    |--------------------------------------------------------------------------
+    |
+    | This is the user foreign key used by Entrust to make a proper
+    | relation between roles and users
+    |
+    */
+    'user_foreign_key' => 'user_id',
+
     /*
     |--------------------------------------------------------------------------
     | Entrust Permission Model
@@ -88,14 +121,12 @@
 
     /*
     |--------------------------------------------------------------------------
-    | Entrust role_user Table
+    | Entrust permission foreign key
     |--------------------------------------------------------------------------
     |
-    | This is the role_user table used by Entrust to save assigned roles to the
-    | database.
+    | This is the permission foreign key used by Entrust to make a proper
+    | relation between permissions and roles
     |
     */
-    'role_user_table' => 'role_user',
-
-
+    'permission_foreign_key' => 'permission_id',
 ];