diff --git a/shell/browser/ui/message_box_mac.mm b/shell/browser/ui/message_box_mac.mm
index 09fa5472b2..2c1db7f947 100644
--- a/shell/browser/ui/message_box_mac.mm
+++ b/shell/browser/ui/message_box_mac.mm
@@ -84,7 +84,7 @@ NSAlert* CreateNSAlert(const MessageBoxSettings& settings) {
 
     // TODO(@codebytere): This behavior violates HIG & should be deprecated.
     if (settings.cancel_id == settings.default_id) {
-      [[ns_buttons objectAtIndex:settings.default_id] highlight:YES];
+      [(NSButton*)[ns_buttons objectAtIndex:settings.default_id] highlight:YES];
     }
   }