diff --git a/lib/shell.js b/lib/shell.js
index e37453a..69f395a 100644
--- a/lib/shell.js
+++ b/lib/shell.js
@@ -56,7 +56,7 @@ var ShellObject = function() {
     
     this.setVisibility = function(visibility) {
         this.visibility = visibility;
-		return this;
+        return this;
     };
     
     // @deprecated