diff --git a/libc/kernel/uapi/linux/mempolicy.h b/libc/kernel/uapi/linux/mempolicy.h
index 6cd8fd1..09ce41e 100644
--- a/libc/kernel/uapi/linux/mempolicy.h
+++ b/libc/kernel/uapi/linux/mempolicy.h
@@ -14,6 +14,7 @@
   MPOL_INTERLEAVE,
   MPOL_LOCAL,
   MPOL_PREFERRED_MANY,
+  MPOL_WEIGHTED_INTERLEAVE,
   MPOL_MAX,
 };
 #define MPOL_F_STATIC_NODES (1 << 15)