diff --git a/includes/ConfigHelper.php b/includes/ConfigHelper.php
index 007714b43..f9b94a5ad 100644
--- a/includes/ConfigHelper.php
+++ b/includes/ConfigHelper.php
@@ -32,7 +32,7 @@ class ConfigHelper {
 	 *
 	 * @return bool
 	 */
-	public static function shouldDisable( array $options, WebRequest $request, Title $title = null ) {
+	public static function shouldDisable( array $options, WebRequest $request, ?Title $title = null ) {
 		$canonicalTitle = $title ? $title->getRootTitle() : null;
 
 		$exclusions = $options[ 'exclude' ] ?? [];
diff --git a/includes/FeatureManagement/Requirements/LimitedWidthContentRequirement.php b/includes/FeatureManagement/Requirements/LimitedWidthContentRequirement.php
index 323df4fb4..03bae1af9 100644
--- a/includes/FeatureManagement/Requirements/LimitedWidthContentRequirement.php
+++ b/includes/FeatureManagement/Requirements/LimitedWidthContentRequirement.php
@@ -48,7 +48,7 @@ final class LimitedWidthContentRequirement implements Requirement {
 	public function __construct(
 		Config $config,
 		WebRequest $request,
-		Title $title = null
+		?Title $title = null
 	) {
 		$this->config = $config;
 		$this->title = $title;
diff --git a/includes/FeatureManagement/Requirements/UserPreferenceRequirement.php b/includes/FeatureManagement/Requirements/UserPreferenceRequirement.php
index b352b1cf1..b236ac697 100644
--- a/includes/FeatureManagement/Requirements/UserPreferenceRequirement.php
+++ b/includes/FeatureManagement/Requirements/UserPreferenceRequirement.php
@@ -61,7 +61,7 @@ final class UserPreferenceRequirement implements Requirement {
 		string $optionName,
 		string $requirementName,
 		WebRequest $request,
-		Title $title = null
+		?Title $title = null
 	) {
 		$this->user = $user;
 		$this->userOptionsLookup = $userOptionsLookup;