diff --git a/tests/phpunit/tests/category/getAllCategoryIds.php b/tests/phpunit/tests/category/getAllCategoryIds.php
index 3fb8223afa060..a03d77492e92a 100644
--- a/tests/phpunit/tests/category/getAllCategoryIds.php
+++ b/tests/phpunit/tests/category/getAllCategoryIds.php
@@ -7,6 +7,15 @@
  */
 class Tests_Category_GetAllCategoryIds extends WP_UnitTestCase {
 
+	/**
+	 * Tear down after each test.
+	 */
+	public function tear_down() {
+		unregister_taxonomy( 'test_tax_cat' );
+
+		parent::tear_down();
+	}
+
 	/**
 	 * Validate get_all_category_ids
 	 *
@@ -22,8 +31,6 @@ public function test_get_all_category_ids() {
 		wp_insert_term( 'test1', 'test_tax_cat' );
 		$cat_ids = get_all_category_ids();
 
-		_unregister_taxonomy( 'test_tax_cat' );
-
 		// Validate length is 1 + created due to uncategorized.
 		$this->assertCount( 3, $cat_ids );
 	}