diff --git a/Models/Employee.php b/Models/Employee.php
index e95f8f3..a874e27 100644
--- a/Models/Employee.php
+++ b/Models/Employee.php
@@ -49,7 +49,7 @@ class Employee
 
     private $status = [];
 
-    public function setAccount(Account $account)
+    public function setAccount(Account $account) : void
     {
         $this->account = $account;
     }
@@ -59,7 +59,7 @@ class Employee
         return $this->account;
     }
 
-    public function setActivity(bool $active)
+    public function setActivity(bool $active) : void
     {
         $this->isActive = $active;
     }
@@ -69,7 +69,7 @@ class Employee
         return $this->isActive;
     }
 
-    public function setUnit($unit)
+    public function setUnit($unit) : void
     {
         $this->unit = $unit;
     }
@@ -79,7 +79,7 @@ class Employee
         return $this->unit;
     }
 
-    public function setDepartment($department)
+    public function setDepartment($department) : void
     {
         $this->department = $department;
     }
@@ -89,7 +89,7 @@ class Employee
         return $this->department;
     }
 
-    public function setPosition($position)
+    public function setPosition($position) : void
     {
         $this->position = $position;
     }
@@ -109,7 +109,7 @@ class Employee
         return [];
     }
 
-    public function getNewestHistory()
+    public function getNewestHistory() : void
     {
 
     }
diff --git a/Models/EmployeeMapper.php b/Models/EmployeeMapper.php
index 4634d19..d41e276 100644
--- a/Models/EmployeeMapper.php
+++ b/Models/EmployeeMapper.php
@@ -38,7 +38,7 @@ final class EmployeeMapper extends DataMapperAbstract
         'hr_staff_active'     => ['name' => 'hr_staff_active', 'type' => 'bool', 'internal' => 'isActive'],
     ];
 
-    static protected $belongsTo = [
+    protected static $belongsTo = [
         'account'    => [
             'mapper' => AccountMapper::class,
             'src'    => 'hr_staff_account',