diff --git a/server/site_tests/firmware_ECWakeSource/firmware_ECWakeSource.py b/server/site_tests/firmware_ECWakeSource/firmware_ECWakeSource.py
index cd804d1..28f0307 100644
--- a/server/site_tests/firmware_ECWakeSource/firmware_ECWakeSource.py
+++ b/server/site_tests/firmware_ECWakeSource/firmware_ECWakeSource.py
@@ -48,7 +48,7 @@
                                      self.POWER_STATE_RETRY_COUNT):
             raise error.TestFail('Platform failed to reach G3 state.')
 
-        self.ec.send_command('hibernate 1000')
+        self.ec.send_command('hibernate')
         time.sleep(self.WAKE_DELAY)
 
         # If AC is plugged during the test, the DUT would wake up right after