diff --git a/tests/unit/Storage/Compression/Algorithms/GZIPTest.php b/tests/unit/Storage/Compression/Algorithms/GZIPTest.php
index b041f8abd5..831c49cb8b 100644
--- a/tests/unit/Storage/Compression/Algorithms/GZIPTest.php
+++ b/tests/unit/Storage/Compression/Algorithms/GZIPTest.php
@@ -12,12 +12,12 @@ class GZIPTest extends TestCase
      */
     protected $object = null;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->object = new GZIP();
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
     }
 
@@ -77,4 +77,4 @@ class GZIPTest extends TestCase
         
         $this->assertEquals($dataSize, 3038056);
     }
-}
\ No newline at end of file
+}