1 files changed, 1 insertions, 1 deletions

diff --git a/js/tool.js b/js/tool.js
index e1c6adb..190f29f 100644
--- a/js/tool.js
+++ b/js/tool.js
@@ -20,5 +20,5 @@ var Tool = Model({
 	}
 })
 
-var Checkbox = Tool({
+var Checkbox = Tool.extend({
 })