diff --git a/libc/kernel/uapi/linux/kernel.h b/libc/kernel/uapi/linux/kernel.h
index eb9490f..1a79728 100644
--- a/libc/kernel/uapi/linux/kernel.h
+++ b/libc/kernel/uapi/linux/kernel.h
@@ -22,4 +22,5 @@
 #define __ALIGN_KERNEL(x,a) __ALIGN_KERNEL_MASK(x, (typeof(x)) (a) - 1)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __ALIGN_KERNEL_MASK(x,mask) (((x) + (mask)) & ~(mask))
+#define __KERNEL_DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 #endif