diff --git a/libc/kernel/uapi/linux/icmp.h b/libc/kernel/uapi/linux/icmp.h
index 3770356..18ecb00 100644
--- a/libc/kernel/uapi/linux/icmp.h
+++ b/libc/kernel/uapi/linux/icmp.h
@@ -83,12 +83,13 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
       __be16 mtu;
     } frag;
+    __u8 reserved[4];
   } un;
-};
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+};
 #define ICMP_FILTER 1
 struct icmp_filter {
   __u32 data;
-};
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+};
 #endif