diff --git a/demo/oop/index.php b/demo/oop/index.php
index 7d658ea..aa1e1be 100644
--- a/demo/oop/index.php
+++ b/demo/oop/index.php
@@ -8,5 +8,5 @@
     ?>
 
     <input type="submit" value="Absenden">
-</>
+</form>