diff --git a/js/src/dropdown.js b/js/src/dropdown.js
index d7eebd8c94d3cca0f5f206567daffe5dfc2c8707..fc2908e7dcf3a0ab8306e279dfc052135554d6e9 100644
--- a/js/src/dropdown.js
+++ b/js/src/dropdown.js
@@ -29,7 +29,7 @@ const Dropdown = (($) => {
   const ARROW_UP_KEYCODE         = 38 // KeyboardEvent.which value for up arrow key
   const ARROW_DOWN_KEYCODE       = 40 // KeyboardEvent.which value for down arrow key
   const RIGHT_MOUSE_BUTTON_WHICH = 3 // MouseEvent.which value for the right button (assuming a right-handed mouse)
-  const REGEXP_KEYDOWN = new RegExp(`${ARROW_UP_KEYCODE}|${ARROW_DOWN_KEYCODE}|${ESCAPE_KEYCODE}`)
+  const REGEXP_KEYDOWN           = new RegExp(`${ARROW_UP_KEYCODE}|${ARROW_DOWN_KEYCODE}|${ESCAPE_KEYCODE}`)
 
   const Event = {
     HIDE             : `hide${EVENT_KEY}`,