diff --git a/get_data.lib.php b/get_data.lib.php
index f6302ce..f8c4ebf 100644
--- a/get_data.lib.php
+++ b/get_data.lib.php
@@ -374,7 +374,7 @@ function upload_dir() {
 }
 
 function is_upload_name($name) {
-  return is_string($name) && preg_match('/^[0-9a-f]{32}$/', $name);
+  return is_string($name) && preg_match('/^[0-9a-f]{32}\z/', $name);
 }
 
 /*