cffi-posix/cffi-unistd

diff --git a/grovel-unistd.lisp b/grovel-unistd.lisp
index 1bc5657..1a11d49 100644
--- a/grovel-unistd.lisp
+++ b/grovel-unistd.lisp
@@ -29,7 +29,6 @@
 (ctype gid-t "gid_t")
 (ctype uid-t "uid_t")
 (ctype off-t "off_t")
-(ctype off64-t "off64_t")
 (ctype useconds-t "useconds_t")
 (ctype pid-t "pid_t")
 (ctype intptr-t "intptr_t")