diff --git a/src/pylorax/executils.py b/src/pylorax/executils.py
index c5ea222e..da5df60c 100644
--- a/src/pylorax/executils.py
+++ b/src/pylorax/executils.py
@@ -327,7 +327,7 @@ def execReadlines(command, argv, stdin=None, root='/', env_prune=None, filter_st
         stderr = subprocess.STDOUT
 
     try:
-        proc = startProgram(argv, root=root, stdin=stdin, stdout=subprocess.PIPE, stderr=stderr, bufsize=1,
+        proc = startProgram(argv, root=root, stdin=stdin, stdout=subprocess.PIPE, stderr=stderr,
                             env_prune=env_prune, env_add=env_add, reset_handlers=reset_handlers, reset_lang=reset_lang)
     except OSError as e:
         with program_log_lock: