diff --git a/lib/foreman/engine.rb b/lib/foreman/engine.rb
index e35ea11..6fb5ba5 100644
--- a/lib/foreman/engine.rb
+++ b/lib/foreman/engine.rb
@@ -58,7 +58,7 @@ private ######################################################################
     concurrency = Foreman::Utils.parse_concurrency(@options[:concurrency])
 
     procfile.entries.each do |entry|
-      reader, writer = IO.pipe
+      reader, writer = IO.pipe("BINARY")
       entry.spawn(concurrency[entry.name], writer, @directory, @environment, port_for(entry, 1, base_port)).each do |process|
         running_processes[process.pid] = process
         readers[process] = reader