diff --git a/libc/kernel/uapi/asm-generic/unistd.h b/libc/kernel/uapi/asm-generic/unistd.h
index 652e7a2..7eaa89a 100644
--- a/libc/kernel/uapi/asm-generic/unistd.h
+++ b/libc/kernel/uapi/asm-generic/unistd.h
@@ -381,7 +381,9 @@
 #define __NR_fsmount 432
 #define __NR_fspick 433
 #define __NR_pidfd_open 434
+#ifdef __ARCH_WANT_SYS_CLONE3
 #define __NR_clone3 435
+#endif
 #define __NR_close_range 436
 #define __NR_openat2 437
 #define __NR_pidfd_getfd 438