diff --git a/tests/framework/class-wc-unit-test-case.php b/tests/framework/class-wc-unit-test-case.php
index 6cf77fed61b..0eda33d48c0 100644
--- a/tests/framework/class-wc-unit-test-case.php
+++ b/tests/framework/class-wc-unit-test-case.php
@@ -22,28 +22,6 @@ class WC_Unit_Test_Case extends WP_UnitTestCase {
 	 */
 	protected $factory;
 
-	/**
-	 * Additional files, relative to the plugin's root directory, that should be explicitly included.
-	 *
-	 * @var array
-	 */
-	protected static $includes;
-
-	/**
-	 * If a test has declared include files, load them before running the tests in the class.
-	 *
-	 * @beforeClass
-	 */
-	public static function include_dependencies() {
-		$base_dir = trailingslashit( dirname( dirname( __DIR__ ) ) );
-
-		if ( ! empty( static::$includes ) ) {
-			foreach ( (array) static::$includes as $include ) {
-				include_once $base_dir . $include;
-			}
-		}
-	}
-
 	/**
 	 * Setup test case.
 	 *
diff --git a/tests/unit-tests/admin/reports/class-wc-tests-admin-report.php b/tests/unit-tests/admin/reports/class-wc-tests-admin-report.php
index 5f29301255d..2ae0ec743dd 100644
--- a/tests/unit-tests/admin/reports/class-wc-tests-admin-report.php
+++ b/tests/unit-tests/admin/reports/class-wc-tests-admin-report.php
@@ -11,13 +11,12 @@
 class WC_Tests_Admin_Report extends WC_Unit_Test_Case {
 
 	/**
-	 * Additional files, relative to the plugin's root directory, that should be explicitly included.
+	 * Load the necessary files, as they're not automatically loaded by WooCommerce.
 	 *
-	 * @var array
 	 */
-	public static $includes = array(
-		'includes/admin/reports/class-wc-admin-report.php',
-	);
+	public static function setUpBeforeClass() {
+		include_once WC_Unit_Tests_Bootstrap::instance()->plugin_dir . '/includes/admin/reports/class-wc-admin-report.php';
+	}
 
 	/**
 	 * Clear cached report data.
diff --git a/tests/unit-tests/admin/reports/class-wc-tests-report-sales-by-date.php b/tests/unit-tests/admin/reports/class-wc-tests-report-sales-by-date.php
index a046d1a2db5..89def3b5903 100644
--- a/tests/unit-tests/admin/reports/class-wc-tests-report-sales-by-date.php
+++ b/tests/unit-tests/admin/reports/class-wc-tests-report-sales-by-date.php
@@ -11,14 +11,12 @@
 class WC_Tests_Report_Sales_By_Date extends WC_Unit_Test_Case {
 
 	/**
-	 * Additional files, relative to the plugin's root directory, that should be explicitly included.
-	 *
-	 * @var array
+	 * Load the necessary files, as they're not automatically loaded by WooCommerce.
 	 */
-	protected static $includes = array(
-		'includes/admin/reports/class-wc-admin-report.php',
-		'includes/admin/reports/class-wc-report-sales-by-date.php',
-	);
+	public static function setUpBeforeClass() {
+		include_once WC_Unit_Tests_Bootstrap::instance()->plugin_dir . '/includes/admin/reports/class-wc-admin-report.php';
+		include_once WC_Unit_Tests_Bootstrap::instance()->plugin_dir . '/includes/admin/reports/class-wc-report-sales-by-date.php';
+	}
 
 	/**
 	 * Clear cached report data.