diff --git a/js/lib/d3.v3.js b/js/lib/d3.v3.js
index b8c1708f8..c275f39ab 100644
--- a/js/lib/d3.v3.js
+++ b/js/lib/d3.v3.js
@@ -1499,6 +1499,10 @@ d3.behavior.zoom = function() {
     d3_eventCancel();
 
     function mousemove() {
+      if (d3.event.which === 0) {
+        mouseup();
+        return;
+      }
       moved = 1;
       translateTo(d3.mouse(target), l);
       dispatch(event_);