diff --git a/wasp/drivers/nrf_rtc.py b/wasp/drivers/nrf_rtc.py
index e68b957..38263c8 100644
--- a/wasp/drivers/nrf_rtc.py
+++ b/wasp/drivers/nrf_rtc.py
@@ -6,6 +6,7 @@
 """
 
 import machine
+import micropython
 import time
 
 #class Stim(object):