diff --git a/lib/sass/tree/debug_node.rb b/lib/sass/tree/debug_node.rb
index 1128eeb9..bf57c3db 100644
--- a/lib/sass/tree/debug_node.rb
+++ b/lib/sass/tree/debug_node.rb
@@ -11,9 +11,9 @@ module Sass
       def _perform(environment)
         res = @expr.perform(environment)
         if filename
-          puts "#{filename}:#{line} DEBUG: #{res}"
+          STDERR.puts "#{filename}:#{line} DEBUG: #{res}"
         else
-          puts "Line #{line} DEBUG: #{res}"
+          STDERR.puts "Line #{line} DEBUG: #{res}"
         end
         []
       end