diff --git a/tests/Unit/CategoryTest.php b/tests/Unit/CategoryTest.php
index c3c9b0de8e..391e291552 100644
--- a/tests/Unit/CategoryTest.php
+++ b/tests/Unit/CategoryTest.php
@@ -20,7 +20,7 @@ class CategoryTest extends TestCase
          ];
         $errors = $a->getErrors();
         foreach ($fields as $field => $fieldTitle) {
-            $this->assertEquals($errors->get($field)[0], "The ${fieldTitle} field is required.");
+            $this->assertEquals($errors->get($field)[0], "The $fieldTitle field is required.");
         }
     }