diff --git a/unpacked/extensions/MathMenu.js b/unpacked/extensions/MathMenu.js
index 51385c018..05a50b56d 100644
--- a/unpacked/extensions/MathMenu.js
+++ b/unpacked/extensions/MathMenu.js
@@ -383,6 +383,7 @@
         HOVER.UnHover(MENU.jax);
       }
       MENU.Unfocus(menu);
+      if (event.type === "mousedown") MENU.CurrentNode().blur();
       return FALSE(event);
     },