diff --git a/plugins/communicators/ssh/communicator.rb b/plugins/communicators/ssh/communicator.rb
index e815dc3a8..40d11ca65 100644
--- a/plugins/communicators/ssh/communicator.rb
+++ b/plugins/communicators/ssh/communicator.rb
@@ -1,3 +1,5 @@
+require 'logger'
+require 'stringio'
 require 'timeout'
 
 require 'log4r'