diff --git a/includes/Compat.php b/includes/Compat.php
new file mode 100644
index 0000000..7345b2e
--- /dev/null
+++ b/includes/Compat.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace MediaWiki\Extension\CrawlerProtection;
+
+class Compat {
+
+    public static function init(): void {
+        self::aliasCoreClasses();
+    }
+
+    private static function aliasCoreClasses(): void {
+
+		if ( class_exists( \Title::class ) && !class_exists( \MediaWiki\Title\Title::class ) ) {
+			class_alias( \Title::class, \MediaWiki\Title\Title::class ); /* < 1.40 */
+		}
+		if ( class_exists( \OutputPage::class ) && !class_exists( \MediaWiki\Output\OutputPage::class ) ) {
+			class_alias( \OutputPage::class, \MediaWiki\Output\OutputPage::class ); /* < 1.41 */
+		}
+		if ( class_exists( \WebRequest::class ) && !class_exists( \MediaWiki\Request\WebRequest::class ) ) {
+			class_alias( \WebRequest::class, \MediaWiki\Request\WebRequest::class ); /* < 1.41 */
+		}
+		if ( class_exists( \SpecialPage::class ) && !class_exists( \MediaWiki\SpecialPage\SpecialPage::class ) ) {
+			class_alias( \SpecialPage::class, \MediaWiki\SpecialPage\SpecialPage::class ); /* < 1.41 */
+		}
+		if ( class_exists( \User::class ) && !class_exists( \MediaWiki\User\User::class ) ) {
+			class_alias( \User::class, \MediaWiki\User\User::class ); /* < 1.41 */
+		}
+		if ( class_exists( \ActionEntryPoint::class ) && !class_exists( \MediaWiki\Actions\ActionEntryPoint::class ) ) {
+			class_alias( \ActionEntryPoint::class, \MediaWiki\Actions\ActionEntryPoint::class ); /* < 1.42 */
+		}
+		if ( class_exists( \Article::class ) && !class_exists( \MediaWiki\Page\Article::class ) ) {
+			class_alias( \Article::class, \MediaWiki\Page\Article::class ); /* < 1.42 */
+		}
+    }
+}