diff --git a/omnisharp.el b/omnisharp.el
index 26f1e0de..92a2813e 100644
--- a/omnisharp.el
+++ b/omnisharp.el
@@ -894,7 +894,7 @@ server process running in the background."
                   (omnisharp--flycheck-error-parser-raw-json
                    output checker buffer))
 
-  :modes (omnisharp-mode))
+  :modes (csharp-mode))
 
 (defun omnisharp--flycheck-error-parser-raw-json (output checker buffer)
   "Takes either a QuickFixResponse or a SyntaxErrorsResponse as a