diff --git a/syscall/linux/constants.lua b/syscall/linux/constants.lua
index 5f72cc2bcd..1b40abd160 100644
--- a/syscall/linux/constants.lua
+++ b/syscall/linux/constants.lua
@@ -161,9 +161,12 @@ c.F = strflag(arch.F or {
   SETLEASE    = 1024,
   GETLEASE    = 1025,
   NOTIFY      = 1026,
+  CANCELLK    = 1029,
+  DUPFD_CLOEXEC = 1030,
   SETPIPE_SZ  = 1031,
   GETPIPE_SZ  = 1032,
-  DUPFD_CLOEXEC = 1030,
+  ADD_SEALS   = 1033,
+  GET_SEALS   = 1034,
 })
 
 -- messy
@@ -208,6 +211,14 @@ c.LOCK = multiflags {
   RW        = 192,
 }
 
+-- for memfd
+c.F_SEAL = multiflags {
+  SEAL     0x0001,
+  SHRINK   0x0002,
+  GROW     0x0004,
+  WRITE    0x0008,
+}
+
 --mmap
 c.PROT = multiflags {
   NONE  = 0x0,