diff --git a/libc/kernel/uapi/linux/mman.h b/libc/kernel/uapi/linux/mman.h
index c5b3130..b0ce77e 100644
--- a/libc/kernel/uapi/linux/mman.h
+++ b/libc/kernel/uapi/linux/mman.h
@@ -19,9 +19,22 @@
 #ifndef _UAPI_LINUX_MMAN_H
 #define _UAPI_LINUX_MMAN_H
 #include <asm/mman.h>
+#include <asm-generic/hugetlb_encode.h>
 #define MREMAP_MAYMOVE 1
 #define MREMAP_FIXED 2
 #define OVERCOMMIT_GUESS 0
 #define OVERCOMMIT_ALWAYS 1
 #define OVERCOMMIT_NEVER 2
+#define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT
+#define MAP_HUGE_MASK HUGETLB_FLAG_ENCODE_MASK
+#define MAP_HUGE_64KB HUGETLB_FLAG_ENCODE_64KB
+#define MAP_HUGE_512KB HUGETLB_FLAG_ENCODE_512KB
+#define MAP_HUGE_1MB HUGETLB_FLAG_ENCODE_1MB
+#define MAP_HUGE_2MB HUGETLB_FLAG_ENCODE_2MB
+#define MAP_HUGE_8MB HUGETLB_FLAG_ENCODE_8MB
+#define MAP_HUGE_16MB HUGETLB_FLAG_ENCODE_16MB
+#define MAP_HUGE_256MB HUGETLB_FLAG_ENCODE_256MB
+#define MAP_HUGE_1GB HUGETLB_FLAG_ENCODE_1GB
+#define MAP_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB
+#define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB
 #endif