diff --git a/libc/kernel/uapi/asm-generic/mman-common.h b/libc/kernel/uapi/asm-generic/mman-common.h
index 047743d..a15624a 100644
--- a/libc/kernel/uapi/asm-generic/mman-common.h
+++ b/libc/kernel/uapi/asm-generic/mman-common.h
@@ -52,9 +52,9 @@
 #define MADV_NOHUGEPAGE 15
 #define MADV_DONTDUMP 16
 #define MADV_DODUMP 17
+#define MADV_WIPEONFORK 18
+#define MADV_KEEPONFORK 19
 #define MAP_FILE 0
-#define MAP_HUGE_SHIFT 26
-#define MAP_HUGE_MASK 0x3f
 #define PKEY_DISABLE_ACCESS 0x1
 #define PKEY_DISABLE_WRITE 0x2
 #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE)