diff --git a/classes/question_ui_renderer.php b/classes/question_ui_renderer.php
index f1d8c79..99b0a2b 100644
--- a/classes/question_ui_renderer.php
+++ b/classes/question_ui_renderer.php
@@ -564,7 +564,7 @@ private function replace_qpy_urls(string $input): string {
 
         return preg_replace_callback(
             // The first two path segments are namespace and short name, and so more restrictive.
-            ";qpy://static(/(?:[a-z_][a-z0-9_]{1,127}){2}(?:/[\w\-@:%+.~=]+)+);",
+            ";qpy://static((?:/[a-z_][a-z0-9_]{0,126}){2}(?:/[\w\-@:%+.~=]+)+);",
             function (array $match) use ($question) {
                 $path = $match[1];
                 $url = \moodle_url::make_pluginfile_url(