diff --git ui/events/keycodes/keyboard_code_conversion_mac.mm ui/events/keycodes/keyboard_code_conversion_mac.mm
index 0d8befe370520..93e324e5e3784 100644
--- ui/events/keycodes/keyboard_code_conversion_mac.mm
+++ ui/events/keycodes/keyboard_code_conversion_mac.mm
@@ -939,7 +939,7 @@ DomKey DomKeyFromNSEvent(NSEvent* event) {
       return DomKeyFromKeyCode(event.keyCode);
     }
     default:
-      NOTREACHED_NORETURN();
+      return ui::DomKey::NONE;
   }
 }