diff --git a/init.el b/init.el
index d7eb7c2..f637378 100644
--- a/init.el
+++ b/init.el
@@ -772,11 +772,6 @@ DOCSTRING is an optional form that is discarded upon expansion."
   ("\\.cljs\\'" . clojurescript-mode)
   ("\\.cljc\\'" . clojurec-mode))
 
-(external-package csharp-mode
-  "Major mode for C#."
-  :mode
-  ("\\.cs\\'" . csharp-mode))
-
 (external-package dart-mode
   "Major mode for Dart."
   :mode