diff --git a/lib/rscons.rb b/lib/rscons.rb
index 826bab1..70c2963 100644
--- a/lib/rscons.rb
+++ b/lib/rscons.rb
@@ -84,3 +84,6 @@ module Rscons
       end
   end
 end
+
+# Unbuffer $stdout
+$stdout.sync = true