diff --git a/lib/ruby_lsp/ruby_lsp_rails/runner_client.rb b/lib/ruby_lsp/ruby_lsp_rails/runner_client.rb
index 6092393d..10435886 100644
--- a/lib/ruby_lsp/ruby_lsp_rails/runner_client.rb
+++ b/lib/ruby_lsp/ruby_lsp_rails/runner_client.rb
@@ -44,7 +44,6 @@ def create_client(outgoing_queue)
 
       class InitializationError < StandardError; end
       class MessageError < StandardError; end
-      class IncompleteMessageError < MessageError; end
       class EmptyMessageError < MessageError; end
 
       extend T::Sig