diff --git a/js/lib/d3.combobox.js b/js/lib/d3.combobox.js
index f8edbcbef..aaf7a3700 100644
--- a/js/lib/d3.combobox.js
+++ b/js/lib/d3.combobox.js
@@ -231,6 +231,8 @@ d3.combobox = function() {
 
         function mousedown() {
 
+            if (shown) return hide();
+
             input.node().focus();
             update('');