diff --git a/lib/cloudfunc.js b/lib/cloudfunc.js
index 236612b4..6e778744 100644
--- a/lib/cloudfunc.js
+++ b/lib/cloudfunc.js
@@ -59,7 +59,7 @@ var Util;
                 lastSlash   = path.lastIndexOf('/');
                 isEqual     = lastSlash === length;
                 
-                if (isStr && isEqual)
+                if (length && isStr && isEqual)
                     path = path.substr(path, length);
             }