diff --git a/libc/kernel/uapi/linux/mman.h b/libc/kernel/uapi/linux/mman.h
index 9fdccf6..a58fc49 100644
--- a/libc/kernel/uapi/linux/mman.h
+++ b/libc/kernel/uapi/linux/mman.h
@@ -20,6 +20,7 @@
 #define _UAPI_LINUX_MMAN_H
 #include <asm/mman.h>
 #include <asm-generic/hugetlb_encode.h>
+#include <linux/types.h>
 #define MREMAP_MAYMOVE 1
 #define MREMAP_FIXED 2
 #define MREMAP_DONTUNMAP 4
@@ -44,4 +45,15 @@
 #define MAP_HUGE_1GB HUGETLB_FLAG_ENCODE_1GB
 #define MAP_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB
 #define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB
+struct cachestat_range {
+  __u64 off;
+  __u64 len;
+};
+struct cachestat {
+  __u64 nr_cache;
+  __u64 nr_dirty;
+  __u64 nr_writeback;
+  __u64 nr_evicted;
+  __u64 nr_recently_evicted;
+};
 #endif