diff --git a/lib/foreman/engine.rb b/lib/foreman/engine.rb
index 139a114..97e5e42 100644
--- a/lib/foreman/engine.rb
+++ b/lib/foreman/engine.rb
@@ -273,10 +273,13 @@ private
     Thread.new do
       begin
         loop do
+          wrote_data = false
           (IO.select(@readers.values).first || []).each do |reader|
             data = reader.gets
+            wrote_data = !data.nil?
             output_with_mutex name_for(@readers.invert[reader]), data
           end
+          sleep(1) unless wrote_data
         end
       rescue Exception => ex
         puts ex.message