diff --git a/libc/kernel/uapi/linux/can.h b/libc/kernel/uapi/linux/can.h
index fc2c230..ca61bbe 100644
--- a/libc/kernel/uapi/linux/can.h
+++ b/libc/kernel/uapi/linux/can.h
@@ -91,4 +91,5 @@
 };
 #define CAN_INV_FILTER 0x20000000U
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define CAN_RAW_FILTER_MAX 512
 #endif