diff --git a/includes/api/ApiLanguageSearch.php b/includes/api/ApiLanguageSearch.php
index 09beef1a..f9a16bdb 100644
--- a/includes/api/ApiLanguageSearch.php
+++ b/includes/api/ApiLanguageSearch.php
@@ -18,6 +18,8 @@
  * @license MIT
  */
 
+use Wikimedia\ParamValidator\ParamValidator;
+
 /**
  * @ingroup API
  */
@@ -34,12 +36,12 @@ class ApiLanguageSearch extends ApiBase {
 	public function getAllowedParams() {
 		return [
 			'search' => [
-				ApiBase::PARAM_REQUIRED => true
+				ParamValidator::PARAM_REQUIRED => true
 			],
 			'typos' => [
-				ApiBase::PARAM_REQUIRED => false,
-				ApiBase::PARAM_TYPE => 'integer',
-				ApiBase::PARAM_DFLT => 1
+				ParamValidator::PARAM_REQUIRED => false,
+				ParamValidator::PARAM_TYPE => 'integer',
+				ParamValidator::PARAM_DEFAULT => 1
 			],
 		];
 	}
diff --git a/includes/api/ApiULSLocalization.php b/includes/api/ApiULSLocalization.php
index 005c66d2..f09d7dda 100644
--- a/includes/api/ApiULSLocalization.php
+++ b/includes/api/ApiULSLocalization.php
@@ -19,6 +19,7 @@
  */
 
 use MediaWiki\Languages\LanguageNameUtils;
+use Wikimedia\ParamValidator\ParamValidator;
 
 /**
  * @ingroup API
@@ -66,8 +67,8 @@ class ApiULSLocalization extends ApiBase {
 	public function getAllowedParams() {
 		return [
 			'language' => [
-				ApiBase::PARAM_REQUIRED => true,
-				ApiBase::PARAM_TYPE => 'string',
+				ParamValidator::PARAM_REQUIRED => true,
+				ParamValidator::PARAM_TYPE => 'string',
 			],
 		];
 	}
diff --git a/includes/api/ApiULSSetLanguage.php b/includes/api/ApiULSSetLanguage.php
index 7d7717e9..73db668d 100644
--- a/includes/api/ApiULSSetLanguage.php
+++ b/includes/api/ApiULSSetLanguage.php
@@ -19,6 +19,7 @@
  */
 
 use MediaWiki\User\UserOptionsManager;
+use Wikimedia\ParamValidator\ParamValidator;
 
 /**
  * @ingroup API
@@ -83,7 +84,7 @@ class ApiULSSetLanguage extends ApiBase {
 	public function getAllowedParams() {
 		return [
 			'languagecode' => [
-				ApiBase::PARAM_REQUIRED => true,
+				ParamValidator::PARAM_REQUIRED => true,
 			]
 		];
 	}