diff --git a/libc/kernel/uapi/linux/can/bcm.h b/libc/kernel/uapi/linux/can/bcm.h
index 42e0782..f5ab2c2 100644
--- a/libc/kernel/uapi/linux/can/bcm.h
+++ b/libc/kernel/uapi/linux/can/bcm.h
@@ -31,7 +31,7 @@
   struct bcm_timeval ival1, ival2;
   canid_t can_id;
   __u32 nframes;
-  struct can_frame frames[0];
+  struct can_frame frames[];
 };
 enum {
   TX_SETUP = 1,
diff --git a/libc/kernel/uapi/linux/can/error.h b/libc/kernel/uapi/linux/can/error.h
index 645373b..f585d2c 100644
--- a/libc/kernel/uapi/linux/can/error.h
+++ b/libc/kernel/uapi/linux/can/error.h
@@ -28,6 +28,7 @@
 #define CAN_ERR_BUSOFF 0x00000040U
 #define CAN_ERR_BUSERROR 0x00000080U
 #define CAN_ERR_RESTARTED 0x00000100U
+#define CAN_ERR_CNT 0x00000200U
 #define CAN_ERR_LOSTARB_UNSPEC 0x00
 #define CAN_ERR_CRTL_UNSPEC 0x00
 #define CAN_ERR_CRTL_RX_OVERFLOW 0x01
@@ -76,4 +77,7 @@
 #define CAN_ERR_TRX_CANL_SHORT_TO_VCC 0x60
 #define CAN_ERR_TRX_CANL_SHORT_TO_GND 0x70
 #define CAN_ERR_TRX_CANL_SHORT_TO_CANH 0x80
+#define CAN_ERROR_WARNING_THRESHOLD 96
+#define CAN_ERROR_PASSIVE_THRESHOLD 128
+#define CAN_BUS_OFF_THRESHOLD 256
 #endif