diff --git a/WordPress/Helpers/EscapingFunctionsTrait.php b/WordPress/Helpers/EscapingFunctionsTrait.php
index 4ebff51396..3df484ff62 100644
--- a/WordPress/Helpers/EscapingFunctionsTrait.php
+++ b/WordPress/Helpers/EscapingFunctionsTrait.php
@@ -84,6 +84,7 @@ trait EscapingFunctionsTrait {
 		'sanitize_hex_color_no_hash' => true,
 		'sanitize_html_class'        => true,
 		'sanitize_key'               => true,
+		'sanitize_locale_name'       => true,
 		'sanitize_user_field'        => true,
 		'tag_escape'                 => true,
 		'urlencode_deep'             => true,
diff --git a/WordPress/Helpers/SanitizationHelperTrait.php b/WordPress/Helpers/SanitizationHelperTrait.php
index c041dfe5c1..18769f2b81 100644
--- a/WordPress/Helpers/SanitizationHelperTrait.php
+++ b/WordPress/Helpers/SanitizationHelperTrait.php
@@ -137,14 +137,15 @@ trait SanitizationHelperTrait {
 	 * @var array<string, bool>
 	 */
 	private $unslashingSanitizingFunctions = array(
-		'absint'       => true,
-		'boolval'      => true,
-		'count'        => true,
-		'doubleval'    => true,
-		'floatval'     => true,
-		'intval'       => true,
-		'sanitize_key' => true,
-		'sizeof'       => true,
+		'absint'               => true,
+		'boolval'              => true,
+		'count'                => true,
+		'doubleval'            => true,
+		'floatval'             => true,
+		'intval'               => true,
+		'sanitize_key'         => true,
+		'sanitize_locale_name' => true,
+		'sizeof'               => true,
 	);
 
 	/**