diff --git a/CHANGELOG.md b/CHANGELOG.md
index 10b3302af..8f0af8fb0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 **Bug Fixes**
 
+-   Fixed fatal error when loading v2 extensions caused by conflicting `registered_controllers()` declarations on `PopupMaker\Plugin\Extension`.
 -   Fixed the "Preview" button in the classic editor not opening popups — a regression introduced in 1.22.0. You can once again preview popups directly from the editor without having to save and view the live page. Thanks to @marklchaves for the fix.
 -   Fixed missing styles for Popup Maker blocks on the front end in some installs — blocks now render with the correct styling without a console warning about a missing stylesheet.
 -   Fixed "Disable popup open tracking" privacy setting not being fully respected — with analytics turned off, popup links no longer get tracking parameters appended and click beacons are no longer sent.
diff --git a/classes/Plugin/Extension.php b/classes/Plugin/Extension.php
index 32fb469f9..43e3d4178 100644
--- a/classes/Plugin/Extension.php
+++ b/classes/Plugin/Extension.php
@@ -13,6 +13,8 @@
 /**
  * Abstract base class for all Popup Maker extensions.
  *
+ * Override {@see Container::registered_controllers()} in child classes.
+ *
  * @since 1.21.0
  */
 abstract class Extension extends Container {
@@ -36,13 +38,6 @@ public function __construct( $config ) {
 		$this->core = \PopupMaker\plugin();
 	}
 
-	/**
-	 * Register all controllers.
-	 *
-	 * @return array<string,\PopupMaker\Base\Controller>
-	 */
-	abstract protected function registered_controllers();
-
 	/**
 	 * Get core plugin instance.
 	 *