diff --git a/src/mmap-patches.lisp b/src/mmap-patches.lisp
deleted file mode 100644
index e1dce18..0000000
--- a/src/mmap-patches.lisp
+++ /dev/null
@@ -1,24 +0,0 @@
-;;; This file contains patches for the MMAP system.
-
-(in-package #:mmap)
-
-(cffi:defcenum (madvise-option :int)
-  ;; Conventional advise values
-  ;;
-  ;; From /usr/include/asm-generic/mman-common.h
-  (:madv-normal     0)
-  (:madv-random     1)
-  (:madv-sequential 2)
-  (:madv-willneed   3)
-  (:madv-dontneed   4))
-
-(cffi:defcfun (u-madvise "madvise") :int
-  (address :pointer)
-  (length size-t)
-  (advice madvise-option))
-
-(defun madvise (addr size advice)
-  (unless (zerop (u-madvise addr size advice))
-    (error "madvise failed"))
-  nil)
-(export '(madvise) :mmap)