diff --git a/Tools/autotest/arducopter.py b/Tools/autotest/arducopter.py
index bfd3c3f21a677..8f985fa94c42f 100644
--- a/Tools/autotest/arducopter.py
+++ b/Tools/autotest/arducopter.py
@@ -7282,7 +7282,7 @@ def FETtecESC_safety_switch(self):
         # before the motors will spin:
         self.wait_esc_telem_rpm(
             esc=mot,
-            rpm_min=0,   # FIXME: was 17640
+            rpm_min=17640,
             rpm_max=17640,
             minimum_duration=2,
             timeout=5,
@@ -7292,7 +7292,7 @@ def FETtecESC_safety_switch(self):
         self.set_safetyswitch_off()
         self.wait_esc_telem_rpm(
             esc=mot,
-            rpm_min=0,   # FIXME: was 17640
+            rpm_min=17640,
             rpm_max=17640,
             minimum_duration=2,
             timeout=5,