diff --git a/www/js/theme.js b/www/js/theme.js
index e5588b0e..0d1e38be 100644
--- a/www/js/theme.js
+++ b/www/js/theme.js
@@ -11,7 +11,7 @@
     }
   }
 
-  if (theme == null || !theme.match(/^\/css\/themes\/\w+.css$/)) {
+  if (theme == null || !theme.match(/^\/css\/themes\/.+?.css$/)) {
     return;
   }