diff --git a/tests/phpunit/tests/functions/isSerialized.php b/tests/phpunit/tests/functions/isSerialized.php
index ff6a2f8786..eb544bed87 100644
--- a/tests/phpunit/tests/functions/isSerialized.php
+++ b/tests/phpunit/tests/functions/isSerialized.php
@@ -5,7 +5,7 @@
  *
  * @ticket 53299
  *
- * @group function
+ * @group functions
  *
  * @covers ::is_serialized
  */
diff --git a/tests/phpunit/tests/functions/pluginBasename.php b/tests/phpunit/tests/functions/pluginBasename.php
index 38a10e2668..ac41348c4c 100644
--- a/tests/phpunit/tests/functions/pluginBasename.php
+++ b/tests/phpunit/tests/functions/pluginBasename.php
@@ -3,7 +3,7 @@
 /**
  * Tests for plugin_basename()
  *
- * @group function
+ * @group functions
  * @group plugins
  *
  * @covers ::plugin_basename
diff --git a/tests/phpunit/tests/functions/wpTimezoneChoiceUsortCallback.php b/tests/phpunit/tests/functions/wpTimezoneChoiceUsortCallback.php
index 58f805833e..5c89cbaf4e 100644
--- a/tests/phpunit/tests/functions/wpTimezoneChoiceUsortCallback.php
+++ b/tests/phpunit/tests/functions/wpTimezoneChoiceUsortCallback.php
@@ -3,7 +3,7 @@
 /**
  * Tests for the _wp_timezone_choice_usort_callback() function.
  *
- * @group function
+ * @group functions
  *
  * @covers ::_wp_timezone_choice_usort_callback
  */