diff --git a/js/pacosako_ui.js b/js/pacosako_ui.js
index 660d270..29c4954 100644
--- a/js/pacosako_ui.js
+++ b/js/pacosako_ui.js
@@ -91,7 +91,14 @@ $(function (){
          let square = $('#cb_phantom');
          if (square.length < 1) {
             square = $(`<div id="cb_phantom" class="cb-phantom"></div>`);
-            square.hide().appendTo('body');
+            square.hide().appendTo('body').droppable({
+               accept: '.cb-piece',
+               disabled: true,
+               deactivate: function(ev, ui){
+                  $(this).droppable('disable');
+               },
+               drop: squareDropDestination,
+            });
          }
          return square;
       } else if (where.match(/^[a-h][1-8]$/)) {
@@ -938,7 +945,7 @@ $(function (){
       }
    }
 
-   $('.cb-square, .cb-phantom').droppable({
+   $('.cb-square').droppable({
       accept: '.cb-piece',
       disabled: true,
       deactivate: function(ev, ui){