diff --git a/sushi-config.yaml b/sushi-config.yaml
index afb1c9e7de..a758e6ea11 100644
--- a/sushi-config.yaml
+++ b/sushi-config.yaml
@@ -113,7 +113,7 @@ menu:
   Known Issues: issues.html
   Features:
     Visualiser: visualiser.html
-    Testing Tool Box: testserver.md
+    Testing Tool Box: testserver.html
   Artifacts: artifacts.html
 
 # ╭───────────────────────────Less Common Implementation Guide Properties──────────────────────────╮