diff --git a/artiq/coredevice/basemod_att.py b/artiq/coredevice/basemod_att.py
index 4f372c33b..5015324ff 100644
--- a/artiq/coredevice/basemod_att.py
+++ b/artiq/coredevice/basemod_att.py
@@ -1,4 +1,4 @@
-from artiq.language.core import kernel, delay
+from artiq.language.core import kernel, portable, delay
 from artiq.language.units import us, ms
 from artiq.coredevice.shiftreg import ShiftReg