diff --git a/includes/FeatureManagement/FeatureManager.php b/includes/FeatureManagement/FeatureManager.php
index c7f4ca9..0f250de 100644
--- a/includes/FeatureManagement/FeatureManager.php
+++ b/includes/FeatureManagement/FeatureManager.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -91,7 +92,7 @@ final class FeatureManager {
 	 * @throws \InvalidArgumentException If the feature references a requirement that isn't
 	 *  registered
 	 */
-	public function registerFeature( $feature, $requirements ) {
+	public function registerFeature( string $feature, $requirements ) {
 		//
 		// Validation
 		if ( array_key_exists( $feature, $this->features ) ) {
@@ -129,7 +130,7 @@ final class FeatureManager {
 	 *
 	 * @throws \InvalidArgumentException If the feature isn't registered
 	 */
-	public function isFeatureEnabled( $feature ) {
+	public function isFeatureEnabled( string $feature ) : bool {
 		if ( !array_key_exists( $feature, $this->features ) ) {
 			throw new \InvalidArgumentException( "The feature \"{$feature}\" isn't registered." );
 		}
@@ -161,13 +162,11 @@ final class FeatureManager {
 	 *
 	 * @throws \LogicException If the requirement has already been registered
 	 */
-	public function registerRequirement( $name, $isMet ) {
+	public function registerRequirement( string $name, bool $isMet ) {
 		if ( array_key_exists( $name, $this->requirements ) ) {
 			throw new \LogicException( "The requirement \"{$name}\" is already registered." );
 		}
 
-		Assert::parameterType( 'boolean', $isMet, 'isMet' );
-
 		$this->requirements[$name] = $isMet;
 	}
 
@@ -179,7 +178,7 @@ final class FeatureManager {
 	 *
 	 * @throws \InvalidArgumentException If the requirement isn't registered
 	 */
-	public function isRequirementMet( $name ) {
+	public function isRequirementMet( string $name ) : bool {
 		if ( !array_key_exists( $name, $this->requirements ) ) {
 			throw new \InvalidArgumentException( "Requirement \"{$name}\" isn't registered." );
 		}
diff --git a/tests/phpunit/unit/FeatureManagement/FeatureManagerTest.php b/tests/phpunit/unit/FeatureManagement/FeatureManagerTest.php
index 22f1420..ff613d3 100644
--- a/tests/phpunit/unit/FeatureManagement/FeatureManagerTest.php
+++ b/tests/phpunit/unit/FeatureManagement/FeatureManagerTest.php
@@ -41,16 +41,6 @@ class FeatureManagerTest extends \MediaWikiUnitTestCase {
 		$featureManager->registerRequirement( 'requirementA', true );
 	}
 
-	/**
-	 * @covers ::registerRequirement
-	 */
-	public function testRegisterRequirementValidatesIsEnabled() {
-		$this->expectException( \Wikimedia\Assert\ParameterAssertionException::class );
-
-		$featureManager = new FeatureManager();
-		$featureManager->registerRequirement( 'requirementA', 'foo' );
-	}
-
 	public static function provideInvalidFeatureConfig() {
 		return [