diff --git a/firmware/ice40-riscv/icE1usb/e1.h b/firmware/ice40-riscv/icE1usb/e1.h
index 8ba9838..4394638 100644
--- a/firmware/ice40-riscv/icE1usb/e1.h
+++ b/firmware/ice40-riscv/icE1usb/e1.h
@@ -16,6 +16,7 @@
 
 #define E1_ERR_F_ALIGN_ERR	0x01
 #define E1_ERR_F_LOS		0x02
+#define E1_ERR_F_RAI		0x04
 
 struct e1_error_count {
 	uint16_t crc;