diff --git a/github-fast-env/bin/github-fast-envd b/github-fast-env/bin/github-fast-envd
index 8f6509b..1efa8b7 100644
--- a/github-fast-env/bin/github-fast-envd
+++ b/github-fast-env/bin/github-fast-envd
@@ -134,6 +134,7 @@ end
 
 def set_up_pseudoterminal(control_socket, pseudoterminal_path)
 	$pseudoterminal_io = File.open(pseudoterminal_path, File::RDWR | File::NOCTTY)
+	$pseudoterminal_io.raw!
 
 	$original_stderr.puts "  connecting to pseudoterminal #{pseudoterminal_path}"