diff --git a/lib/bsd/capsicum/constants.rb b/lib/bsd/capsicum/constants.rb
index 41c987a..cf06859 100644
--- a/lib/bsd/capsicum/constants.rb
+++ b/lib/bsd/capsicum/constants.rb
@@ -1,68 +1,69 @@
 module BSD::Capsicum
   ##
   # The constants found in this module are defined
-  # by sys/capsicum.h. Their documentation can be found
-  # in the
+  # by sys/capsicum.h and sys/caprights.h. Their
+  # documentation can be found in the
   # [rights(4)](https://man.freebsd.org/cgi/man.cgi?query=rights&apropos=0&sektion=4&format=html)
   # man page
   module Constants
-    CAP_ACCEPT        = 0x200000020000000
-    CAP_ACL_CHECK     = 0x400000000010000
-    CAP_ACL_DELETE    = 0x400000000020000
-    CAP_ACL_GET       = 0x400000000040000
-    CAP_ACL_SET       = 0x400000000080000
-    CAP_BIND          = 0x200000040000000
-    CAP_BINDAT        = 0x200008000000400
-    CAP_CHFLAGSAT     = 0x200000000001400
-    CAP_CONNECT       = 0x200000080000000
-    CAP_CREATE        = 0x200000000000040
-    CAP_EVENT         = 0x400000000000020
-    CAP_FCHDIR        = 0x200000000000800
-    CAP_FCHFLAGS      = 0x200000000001000
-    CAP_FCHMOD        = 0x200000000002000
-    CAP_FCHMODAT      = 0x200000000002400
-    CAP_FCHOWN        = 0x200000000004000
-    CAP_FCHOWNAT      = 0x200000000004400
-    CAP_FCNTL         = 0x200000000008000
-    CAP_FEXECVE       = 0x200000000000080
-    CAP_FLOCK         = 0x200000000010000
-    CAP_FPATHCONF     = 0x200000000020000
-    CAP_FSCK          = 0x200000000040000
-    CAP_FSTAT         = 0x200000000080000
-    CAP_FSTATAT       = 0x200000000080400
-    CAP_FSTATFS       = 0x200000000100000
-    CAP_FSYNC         = 0x200000000000100
-    CAP_FTRUNCATE     = 0x200000000000200
-    CAP_FUTIMES       = 0x200000000200000
-    CAP_FUTIMESAT     = 0x200000000200400
-    CAP_GETPEERNAME   = 0x200000100000000
-    CAP_GETSOCKNAME   = 0x200000200000000
-    CAP_GETSOCKOPT    = 0x200000400000000
-    CAP_IOCTL         = 0x400000000000080
-    CAP_KQUEUE        = 0x400000000100040
-    CAP_LOOKUP        = 0x200000000000400
-    CAP_MAC_GET       = 0x400000000000001
-    CAP_MAC_SET       = 0x400000000000002
-    CAP_MKDIRAT       = 0x200000000800400
-    CAP_MKFIFOAT      = 0x200000001000400
-    CAP_MKNODAT       = 0x200000002000400
-    CAP_MMAP          = 0x200000000000010
-    CAP_PDGETPID      = 0x400000000000200
-    CAP_PDKILL        = 0x400000000000800
-    CAP_PDWAIT        = 0x400000000000400
-    CAP_PEELOFF       = 0x200001000000000
-    CAP_PREAD         = 0x20000000000000d
-    CAP_PWRITE        = 0x20000000000000e
-    CAP_READ          = 0x200000000000001
-    CAP_RECV          = 0x200000000000001
-    CAP_SEEK          = 0x20000000000000c
-    CAP_SEM_GETVALUE  = 0x400000000000004
-    CAP_SEM_POST      = 0x400000000000008
-    CAP_SEM_WAIT      = 0x400000000000010
-    CAP_SETSOCKOPT    = 0x200002000000000
-    CAP_SHUTDOWN      = 0x200004000000000
-    CAP_TTYHOOK       = 0x400000000000100
-    CAP_UNLINKAT      = 0x200000010000400
-    CAP_WRITE         = 0x200000000000002
+    CAP_RIGHTS_VERSION = 0x0
+    CAP_ACCEPT         = 0x200000020000000
+    CAP_ACL_CHECK      = 0x400000000010000
+    CAP_ACL_DELETE     = 0x400000000020000
+    CAP_ACL_GET        = 0x400000000040000
+    CAP_ACL_SET        = 0x400000000080000
+    CAP_BIND           = 0x200000040000000
+    CAP_BINDAT         = 0x200008000000400
+    CAP_CHFLAGSAT      = 0x200000000001400
+    CAP_CONNECT        = 0x200000080000000
+    CAP_CREATE         = 0x200000000000040
+    CAP_EVENT          = 0x400000000000020
+    CAP_FCHDIR         = 0x200000000000800
+    CAP_FCHFLAGS       = 0x200000000001000
+    CAP_FCHMOD         = 0x200000000002000
+    CAP_FCHMODAT       = 0x200000000002400
+    CAP_FCHOWN         = 0x200000000004000
+    CAP_FCHOWNAT       = 0x200000000004400
+    CAP_FCNTL          = 0x200000000008000
+    CAP_FEXECVE        = 0x200000000000080
+    CAP_FLOCK          = 0x200000000010000
+    CAP_FPATHCONF      = 0x200000000020000
+    CAP_FSCK           = 0x200000000040000
+    CAP_FSTAT          = 0x200000000080000
+    CAP_FSTATAT        = 0x200000000080400
+    CAP_FSTATFS        = 0x200000000100000
+    CAP_FSYNC          = 0x200000000000100
+    CAP_FTRUNCATE      = 0x200000000000200
+    CAP_FUTIMES        = 0x200000000200000
+    CAP_FUTIMESAT      = 0x200000000200400
+    CAP_GETPEERNAME    = 0x200000100000000
+    CAP_GETSOCKNAME    = 0x200000200000000
+    CAP_GETSOCKOPT     = 0x200000400000000
+    CAP_IOCTL          = 0x400000000000080
+    CAP_KQUEUE         = 0x400000000100040
+    CAP_LOOKUP         = 0x200000000000400
+    CAP_MAC_GET        = 0x400000000000001
+    CAP_MAC_SET        = 0x400000000000002
+    CAP_MKDIRAT        = 0x200000000800400
+    CAP_MKFIFOAT       = 0x200000001000400
+    CAP_MKNODAT        = 0x200000002000400
+    CAP_MMAP           = 0x200000000000010
+    CAP_PDGETPID       = 0x400000000000200
+    CAP_PDKILL         = 0x400000000000800
+    CAP_PDWAIT         = 0x400000000000400
+    CAP_PEELOFF        = 0x200001000000000
+    CAP_PREAD          = 0x20000000000000d
+    CAP_PWRITE         = 0x20000000000000e
+    CAP_READ           = 0x200000000000001
+    CAP_RECV           = 0x200000000000001
+    CAP_SEEK           = 0x20000000000000c
+    CAP_SEM_GETVALUE   = 0x400000000000004
+    CAP_SEM_POST       = 0x400000000000008
+    CAP_SEM_WAIT       = 0x400000000000010
+    CAP_SETSOCKOPT     = 0x200002000000000
+    CAP_SHUTDOWN       = 0x200004000000000
+    CAP_TTYHOOK        = 0x400000000000100
+    CAP_UNLINKAT       = 0x200000010000400
+    CAP_WRITE          = 0x200000000000002
   end
 end
diff --git a/lib/bsd/capsicum/ffi.rb b/lib/bsd/capsicum/ffi.rb
index 5cd84e8..9066acb 100644
--- a/lib/bsd/capsicum/ffi.rb
+++ b/lib/bsd/capsicum/ffi.rb
@@ -3,6 +3,8 @@ module BSD::Capsicum
   module FFI
     require "fiddle"
     include Fiddle::Types
+    include Constants
+
     module_function
 
     ##
@@ -52,7 +54,7 @@ module BSD::Capsicum
         libc["__cap_rights_init"],
         [INT, VOIDP, VARIADIC],
         VOIDP
-      ).call(0, voidp, *varargs)
+      ).call(CAP_RIGHTS_VERSION, voidp, *varargs)
       voidp
     end