diff --git a/includes/Api/ApiULSSetLanguage.php b/includes/Api/ApiULSSetLanguage.php
index d5fc2047..80d1ff55 100644
--- a/includes/Api/ApiULSSetLanguage.php
+++ b/includes/Api/ApiULSSetLanguage.php
@@ -59,7 +59,7 @@ class ApiULSSetLanguage extends ApiBase {
 			$this->dieWithError( [ 'apierror-mustbeposted', $request->getText( 'action' ) ] );
 		}
 
-		$languageCode = $request->getText( 'languagecode' );
+		$languageCode = $request->getRawVal( 'languagecode', '' );
 		if ( !$this->languageNameUtils->isSupportedLanguage( $languageCode ) ) {
 			$this->dieWithError(
 				[ 'apierror-invalidlang', $this->encodeParamName( 'languagecode' ) ]
diff --git a/includes/Hooks.php b/includes/Hooks.php
index cdfd8a18..019d0891 100644
--- a/includes/Hooks.php
+++ b/includes/Hooks.php
@@ -313,7 +313,7 @@ class Hooks implements
 
 		if (
 			// uselang can be used for temporary override of language preference
-			$request->getText( 'uselang' ) ||
+			$request->getRawVal( 'uselang' ) ||
 			// Registered user: use preferences, only when safe to load - T267445
 			( $user->isSafeToLoad() && $user->isRegistered() )
 		) {
@@ -524,7 +524,7 @@ class Hooks implements
 	}
 
 	private function getSetLang( OutputPage $out ): ?string {
-		$setLangCode = $out->getRequest()->getText( 'setlang' );
+		$setLangCode = $out->getRequest()->getRawVal( 'setlang' );
 		if ( $setLangCode && $this->languageNameUtils->isSupportedLanguage( $setLangCode ) ) {
 			return $setLangCode;
 		}