diff --git a/libc/kernel/arch-x86/asm/shmbuf.h b/libc/kernel/arch-x86/asm/shmbuf.h
index 5ecfe08..81cce3e 100644
--- a/libc/kernel/arch-x86/asm/shmbuf.h
+++ b/libc/kernel/arch-x86/asm/shmbuf.h
@@ -23,32 +23,39 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  size_t shm_segsz;
  __kernel_time_t shm_atime;
+#ifdef __i386__
  unsigned long __unused1;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#endif
  __kernel_time_t shm_dtime;
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#ifdef __i386__
  unsigned long __unused2;
- __kernel_time_t shm_ctime;
- unsigned long __unused3;
- __kernel_pid_t shm_cpid;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#endif
+ __kernel_time_t shm_ctime;
+#ifdef __i386__
+ unsigned long __unused3;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#endif
+ __kernel_pid_t shm_cpid;
  __kernel_pid_t shm_lpid;
  unsigned long shm_nattch;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long __unused4;
  unsigned long __unused5;
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
 struct shminfo64 {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long shmmax;
  unsigned long shmmin;
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long shmmni;
  unsigned long shmseg;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long shmall;
  unsigned long __unused1;
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long __unused2;
  unsigned long __unused3;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long __unused4;
 };
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif