diff --git a/src/python/devtest/os/test/test.py b/src/python/devtest/os/test/test.py
index 219bb7c..4108ad3 100644
--- a/src/python/devtest/os/test/test.py
+++ b/src/python/devtest/os/test/test.py
@@ -25,7 +25,7 @@ async def expect(conn, cmd=None, regex=None, subject=None, act_timeout=0.1, tota
     if subject == None:
         subject = ">" + regex + "<"
     while True:
-        flags = Connection.Flags.ReadStripNewline|Connection.Flags.ReadDecodeToString
+        flags = Connection.Flags.ReadStripNewline|Connection.Flags.ReadDecodeToString|Connection.Flags.ReadOnlyPrintable
         timeout = act_timeout
         now = time.time()
         if deadline is not None: