diff --git a/src/dat/gui/GUI.js b/src/dat/gui/GUI.js
index e037111..79908c0 100644
--- a/src/dat/gui/GUI.js
+++ b/src/dat/gui/GUI.js
@@ -1023,8 +1023,8 @@ function add(gui, object, property, params) {
 }
 
 function getLocalStorageHash(gui, key) {
-  // TODO how does this deal with multiple GUI's?
-  return document.location.href + '.' + key;
+  var namespace = localStorage.getItem('dat.gui.namespace') || document.location.href;
+  return 'dat.gui.' + namespace + '.' + key;
 }
 
 function addPresetOption(gui, name, setSelected) {