diff --git a/Tools/Replay/check_replay.py b/Tools/Replay/check_replay.py
index cd73b1cd15..7f6a576702 100755
--- a/Tools/Replay/check_replay.py
+++ b/Tools/Replay/check_replay.py
@@ -6,7 +6,7 @@ check that replay produced identical results
 
 from __future__ import print_function
 
-def check_log(logfile, progress, ekf2_only=False, ekf3_only=False, verbose=False):
+def check_log(logfile, progress=print, ekf2_only=False, ekf3_only=False, verbose=False):
     '''check replay log for matching output'''
     from pymavlink import mavutil
     progress("Processing log %s" % logfile)