diff --git a/wp-includes/general-template.php b/wp-includes/general-template.php
index ed91e5bd17..527d740c0a 100644
--- a/wp-includes/general-template.php
+++ b/wp-includes/general-template.php
@@ -715,7 +715,7 @@ function get_bloginfo( $show = '', $filter = 'raw' ) {
 			 */
 			$output = __( 'html_lang_attribute' );
 			if ( 'html_lang_attribute' === $output || preg_match( '/[^a-zA-Z0-9-]/', $output ) ) {
-				$output = get_locale();
+				$output = is_admin() ? get_user_locale() : get_locale();
 				$output = str_replace( '_', '-', $output );
 			}
 			break;