diff --git a/tests/Spout/Writer/XLSX/Helper/StyleHelperTest.php b/tests/Spout/Writer/XLSX/Helper/StyleHelperTest.php
index 333c1c2..4f276fd 100644
--- a/tests/Spout/Writer/XLSX/Helper/StyleHelperTest.php
+++ b/tests/Spout/Writer/XLSX/Helper/StyleHelperTest.php
@@ -35,11 +35,11 @@ class StyleHelperTest extends \PHPUnit_Framework_TestCase
         $this->assertNull($style2->getId());
 
         $styleHelper = new StyleHelper($this->defaultStyle);
-        $registeredStyle1 = $styleHelper->registerStyle($style1);
-        $registeredStyle2 = $styleHelper->registerStyle($style2);
+        $registeredStyles = $styleHelper->registerStyle($style1);
+        $registeredStyles = $styleHelper->registerStyle($style2);
 
-        $this->assertEquals(1, $registeredStyle1->getId());
-        $this->assertEquals(2, $registeredStyle2->getId());
+        $this->assertEquals(1, $registeredStyles[0]->getId());
+        $this->assertEquals(2, $registeredStyles[1]->getId());
     }
 
     /**
@@ -50,11 +50,11 @@ class StyleHelperTest extends \PHPUnit_Framework_TestCase
         $style = (new StyleBuilder())->setFontBold()->build();
 
         $styleHelper = new StyleHelper($this->defaultStyle);
-        $registeredStyle1 = $styleHelper->registerStyle($style);
-        $registeredStyle2 = $styleHelper->registerStyle($style);
+        $registeredStyles = $styleHelper->registerStyle($style);
+        $registeredStyles = $styleHelper->registerStyle($style);
 
-        $this->assertEquals(1, $registeredStyle1->getId());
-        $this->assertEquals(1, $registeredStyle2->getId());
+        $this->assertEquals(1, $registeredStyles[0]->getId());
+        $this->assertEquals(1, $registeredStyles[0]->getId());
     }
 
     /**