diff --git a/src/mainboard/google/poppy/variants/nocturne/include/variant/ec.h b/src/mainboard/google/poppy/variants/nocturne/include/variant/ec.h
index 92c7467f12..7e168010cf 100644
--- a/src/mainboard/google/poppy/variants/nocturne/include/variant/ec.h
+++ b/src/mainboard/google/poppy/variants/nocturne/include/variant/ec.h
@@ -77,5 +77,6 @@
 #define SIO_EC_HOST_ENABLE	/* EC Host Interface Resources */
 
 #define EC_ENABLE_MKBP_DEVICE  /* Enable cros_ec_keyb device */
+#define EC_ENABLE_CBAS_DEVICE  /* Enable "Base Attached Switch" device */
 
 #endif /* __MAINBOARD_EC_H__ */