diff --git a/lib/foreman/process.rb b/lib/foreman/process.rb
index 75b454d..ac929fa 100644
--- a/lib/foreman/process.rb
+++ b/lib/foreman/process.rb
@@ -31,6 +31,7 @@ private
     reader, writer = IO.pipe
     pid = fork do
       trap("INT", "IGNORE")
+      writer.sync = true
       $stdout.reopen writer
       $stderr.reopen writer
       reader.close