diff --git a/artiq/coredevice/spi.py b/artiq/coredevice/spi.py
index c28cf828d..5b0c6bb88 100644
--- a/artiq/coredevice/spi.py
+++ b/artiq/coredevice/spi.py
@@ -1,4 +1,4 @@
-from artiq.language.core import (kernel, portable, seconds_to_mu, now_mu,
+from artiq.language.core import (kernel, seconds_to_mu, now_mu,
                                  delay_mu, int)
 from artiq.language.units import MHz
 from artiq.coredevice.rt2wb import rt2wb_output, rt2wb_input