diff --git a/tests/CurlyMethodsTest.php b/tests/CurlyMethodsTest.php
index f92aa86..eed3d49 100644
--- a/tests/CurlyMethodsTest.php
+++ b/tests/CurlyMethodsTest.php
@@ -199,7 +199,7 @@ class CurlyMethodsTest extends TestCase
     /**
      * @throws \ivuorinen\Curly\Exceptions\HTTPException
      */
-    protected function setUp()
+    protected function setUp() : void
     {
         parent::setUp();
         $this->curly = new Curly;