diff --git a/Tools/autotest/common.py b/Tools/autotest/common.py
index fb2fafeb16..4f8cc063e8 100644
--- a/Tools/autotest/common.py
+++ b/Tools/autotest/common.py
@@ -4983,7 +4983,7 @@ Also, ignores heartbeats not from our target system'''
                         for param_name in param_names:
                             self.progress("%s=%f" % (param_name, self.get_parameter(param_name)))
                         if m.cal_status == mavutil.mavlink.MAG_CAL_SUCCESS:
-                            if reached_pct[m.compass_id] < 99:
+                            if reached_pct[m.compass_id] < 98:
                                 raise NotAchievedException("Mag calibration report SUCCESS without 100%% completion")
                             report_get[m.compass_id] = 1
                         else: