diff --git a/core/modules/system/src/Tests/Theme/TwigTransTest.php b/core/modules/system/src/Tests/Theme/TwigTransTest.php
index 007b6e9..2a49f73 100644
--- a/core/modules/system/src/Tests/Theme/TwigTransTest.php
+++ b/core/modules/system/src/Tests/Theme/TwigTransTest.php
@@ -188,7 +188,7 @@ public function testPlaceholderOutsideOfTrans() {
 
     $script = '<script>alert(123);</script>';
     $this->assertNoRaw($script);
-    $this->assertEqual(2, substr_count($this->getRawContent(), '<em class="placeholder" >' . SafeMarkup::checkPlain($script)) . '</em>');
+    $this->assertEqual(2, substr_count($this->getRawContent(), '<em class="placeholder">' . SafeMarkup::checkPlain($script)) . '</em>');
   }
 
   /**