diff --git a/test/test_command_chain.vader b/test/test_command_chain.vader
index f471e15..96c07e7 100644
--- a/test/test_command_chain.vader
+++ b/test/test_command_chain.vader
@@ -28,10 +28,12 @@ Before:
   \   {
   \     'callback': 'RunFirstEcho',
   \     'output_stream': 'stdout',
+  \     'read_buffer': 0,
   \   },
   \   {
   \     'callback': 'RunSecondEcho',
   \     'output_stream': 'stdout',
+  \     'read_buffer': 0,
   \   },
   \ ],
   \})