diff --git a/modules/helpers.js b/modules/helpers.js
index 2669025..f97f77b 100644
--- a/modules/helpers.js
+++ b/modules/helpers.js
@@ -6,7 +6,7 @@ var skins = require("./skins");
 var fs = require("fs");
 
 // 0098cb60-fa8e-427c-b299-793cbd302c9a
-var valid_uuid = /^([0-9a-f-]{32,36}|[a-zA-Z0-9_]{1,16})$/; // uuid|username
+var valid_uuid = /^([0-9a-f-A-F-]{32,36}|[a-zA-Z0-9_]{1,16})$/; // uuid|username
 var hash_pattern = /[0-9a-f]+$/;
 
 function get_hash(url) {