diff --git a/_Sidebar.md b/_Sidebar.md
index fa56143..9897656 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -13,7 +13,7 @@
 ## Protokolle
 
 - [Transmission Control Protocol](./Protokolle/Transmission-Control-Protocol)
-- [User Datagram Protocol](./Protokolle/User Datagram Protocol)
+- [User Datagram Protocol](./Protokolle/User-Datagram-Protocol)
 
 ## Tools