diff --git a/src/MemcachedBackend.php b/src/MemcachedBackend.php
index 02d1a4f..dc67c65 100644
--- a/src/MemcachedBackend.php
+++ b/src/MemcachedBackend.php
@@ -135,7 +135,7 @@ class MemcachedBackend implements CacheBackendInterface {
         'tags' => array(),
       );
 
-      assert('\Drupal\Component\Assertion\Inspector::assertAllStrings($item[\'tags\'])', 'Cache Tags must be strings.');
+      assert(\Drupal\Component\Assertion\Inspector::assertAllStrings($item['tags']), 'Cache Tags must be strings.');
 
       // Organize tags.
       $item['tags'] = array_unique($item['tags']);