diff --git a/tests/legacy/includes/listener-loader.php b/tests/legacy/includes/listener-loader.php
deleted file mode 100644
index 1a5cb58459f..00000000000
--- a/tests/legacy/includes/listener-loader.php
+++ /dev/null
@@ -1,47 +0,0 @@
-<?php
-/**
- * Listener loader.
- *
- * @package WooCommerce\UnitTests
- */
-
-$wp_tests_dir = getenv( 'WP_TESTS_DIR' ) ? getenv( 'WP_TESTS_DIR' ) : sys_get_temp_dir() . '/wordpress-tests-lib';
-
-// Polyfill a function that wasn't added until WordPress 5.1.
-if ( ! function_exists( 'tests_get_phpunit_version' ) ) {
-	/**
-	 * Retrieves PHPUnit runner version.
-	 */
-	function tests_get_phpunit_version() {
-		if ( class_exists( 'PHPUnit_Runner_Version' ) ) {
-			$version = PHPUnit_Runner_Version::id();
-		} elseif ( class_exists( 'PHPUnit\Runner\Version' ) ) {
-			// Must be parsable by PHP 5.2.x.
-			$version = call_user_func( 'PHPUnit\Runner\Version::id' );
-		} else {
-			$version = 0;
-		}
-
-		return $version;
-	}
-}
-
-/**
- * The listener-loader.php file wasn't introduced into the core test framework until r44701, which
- * means it came after WordPress 5.0 (r43971).
- *
- * Once WordPress 5.0 is no longer supported, we can safely reduce this to:
- *
- *   require_once $wp_tests_dir . '/includes/listener-loader.php';
- *
- * @link https://core.trac.wordpress.org/changeset/44701/
- */
-if ( file_exists( $wp_tests_dir . '/includes/listener-loader.php' ) ) {
-	require_once $wp_tests_dir . '/includes/listener-loader.php';
-} else {
-	if ( version_compare( tests_get_phpunit_version(), '7.0', '>=' ) ) {
-		require $wp_tests_dir . '/includes/phpunit7/speed-trap-listener.php';
-	} else {
-		require $wp_tests_dir . '/includes/speed-trap-listener.php';
-	}
-}