diff --git a/core/modules/system/lib/Drupal/system/Tests/Theme/ThemeTest.php b/core/modules/system/lib/Drupal/system/Tests/Theme/ThemeTest.php
index 73b049d..9f3c477 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Theme/ThemeTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Theme/ThemeTest.php
@@ -64,7 +64,7 @@ function testThemeDataTypes() {
     // theme_test_false is an implemented theme hook so theme() should return a
     // string, even though the theme function itself can return anything.
     $foos = array('null' => NULL, 'false' => FALSE, 'integer' => 1, 'string' => 'foo');
-    foreach($foos as $type => $example) {
+    foreach ($foos as $type => $example) {
       $output = theme('theme_test_foo', array('foo' => $example));
       $this->assertTrue(is_string($output), 'theme() returns a string for data type ' . $type);
     }