diff --git a/src/xterm.js b/src/xterm.js
index 94257e24..e0264d64 100644
--- a/src/xterm.js
+++ b/src/xterm.js
@@ -585,7 +585,7 @@
 
       on(this.element, 'mouseup', function() {
         var selection = document.getSelection();
-        if (selection.type != 'Range') {
+        if (selection.isCollapsed) {
           self.focus();
         }
       });