diff --git a/src/js/_enqueues/lib/auth-check.js b/src/js/_enqueues/lib/auth-check.js
index a31f3cce10..be2a37cfc0 100644
--- a/src/js/_enqueues/lib/auth-check.js
+++ b/src/js/_enqueues/lib/auth-check.js
@@ -23,7 +23,7 @@
 		if ( form.length ) {
 			// Add unload confirmation to counter (frame-busting) JS redirects.
 			$(window).on( 'beforeunload.wp-auth-check', function(e) {
-				e.originalEvent.returnValue = window.authcheckL10n.beforeunload;
+				e.originalEvent.returnValue = wp.i18n.__( 'Your session has expired. You can log in again from this page or go to the login page.' );
 			});
 
 			frame = $('<iframe id="wp-auth-check-frame" frameborder="0">').attr( 'title', noframe.text() );
diff --git a/src/wp-includes/script-loader.php b/src/wp-includes/script-loader.php
index 9f1268fc2f..63e5d08a7f 100644
--- a/src/wp-includes/script-loader.php
+++ b/src/wp-includes/script-loader.php
@@ -699,13 +699,7 @@ function wp_default_scripts( $scripts ) {
 	);
 
 	$scripts->add( 'wp-auth-check', "/wp-includes/js/wp-auth-check$suffix.js", array( 'heartbeat' ), false, 1 );
-	did_action( 'init' ) && $scripts->localize(
-		'wp-auth-check',
-		'authcheckL10n',
-		array(
-			'beforeunload' => __( 'Your session has expired. You can log in again from this page or go to the login page.' ),
-		)
-	);
+	$scripts->set_translations( 'wp-auth-check' );
 
 	$scripts->add( 'wp-lists', "/wp-includes/js/wp-lists$suffix.js", array( 'wp-ajax-response', 'jquery-color' ), false, 1 );