diff --git a/lib/document_handler.js b/lib/document_handler.js
index 8b7a18c..2ef7421 100644
--- a/lib/document_handler.js
+++ b/lib/document_handler.js
@@ -80,7 +80,7 @@ DocumentHandler.prototype.chooseKey = function(callback) {
 
 // Return a boolean indicating whether or not something can be a key
 DocumentHandler.potentialKey = function(key) {
-  return key.match(/^[a-zA-Z0-9]+(\.[a-zA-Z]+?)$/);
+  return key.match(/^[a-zA-Z0-9]+(\.[a-zA-Z]+)?$/);
 };
 
 // Generate a random key