diff --git a/pkgs/development/libraries/zlib/default.nix b/pkgs/development/libraries/zlib/default.nix
index d3f1bfda456..1776e1349e6 100644
--- a/pkgs/development/libraries/zlib/default.nix
+++ b/pkgs/development/libraries/zlib/default.nix
@@ -9,9 +9,7 @@ stdenv.mkDerivation rec {
     sha256 = "06x6m33ls1606ni7275q5z392csvh18dgs55kshfnvrfal45w8r1";
   };
 
-  patches =
-    [ ./zlib-LARGEFILE64_SOURCE.patch ]
-    ++ stdenv.lib.optional (stdenv.system == "i686-cygwin") [ ./no-shared.patch ];
+  patches = stdenv.lib.optional (stdenv.system == "i686-cygwin") [ ./no-shared.patch ];
 
   configureFlags = if static then "" else "--shared";
 
diff --git a/pkgs/development/libraries/zlib/zlib-LARGEFILE64_SOURCE.patch b/pkgs/development/libraries/zlib/zlib-LARGEFILE64_SOURCE.patch
deleted file mode 100644
index 6ddb0ad7066..00000000000
--- a/pkgs/development/libraries/zlib/zlib-LARGEFILE64_SOURCE.patch
+++ /dev/null
@@ -1,69 +0,0 @@
-http://mail.madler.net/pipermail/zlib-devel_madler.net/2011-June/002583.html
-
-[Zlib-devel] Possible typo in zlib.h
-
-Mark Adler madler at madler.net
-
-*** a/zlib.h    2010-04-19 21:12:48.000000000 -0700
---- b/zlib.h  2011-02-26 21:23:30.000000000 -0800
-***************
-*** 1572,1584 ****
-  #endif
-  
-  #if !defined(ZLIB_INTERNAL) && _FILE_OFFSET_BITS-0 == 64 && _LFS64_LARGEFILE-0
-! #  define gzopen gzopen64
-! #  define gzseek gzseek64
-! #  define gztell gztell64
-! #  define gzoffset gzoffset64
-! #  define adler32_combine adler32_combine64
-! #  define crc32_combine crc32_combine64
-! #  ifdef _LARGEFILE64_SOURCE
-       ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
-       ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, z_off_t, int));
-       ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile));
---- 1580,1601 ----
-  #endif
-  
-  #if !defined(ZLIB_INTERNAL) && _FILE_OFFSET_BITS-0 == 64 && _LFS64_LARGEFILE-0
-! #  ifdef Z_PREFIX_SET
-! #    define z_gzopen z_gzopen64
-! #    define z_gzseek z_gzseek64
-! #    define z_gztell z_gztell64
-! #    define z_gzoffset z_gzoffset64
-! #    define z_adler32_combine z_adler32_combine64
-! #    define z_crc32_combine z_crc32_combine64
-! #  else
-! #    define gzopen gzopen64
-! #    define gzseek gzseek64
-! #    define gztell gztell64
-! #    define gzoffset gzoffset64
-! #    define adler32_combine adler32_combine64
-! #    define crc32_combine crc32_combine64
-! #  endif
-! #  ifndef _LARGEFILE64_SOURCE
-       ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
-       ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, z_off_t, int));
-       ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile));
-*** a/zconf.h.in    2010-04-18 10:58:06.000000000 -0700
---- b/zconf.h.in  2010-07-18 09:05:49.000000000 -0700
-***************
-*** 374,380 ****
-  #  undef _LARGEFILE64_SOURCE
-  #endif
-  
-! #if defined(Z_HAVE_UNISTD_H) || defined(_LARGEFILE64_SOURCE)
-  #  include <unistd.h>       /* for SEEK_* and off_t */
-  #  ifdef VMS
-  #    include <unixio.h>     /* for off_t */
---- 375,385 ----
-  #  undef _LARGEFILE64_SOURCE
-  #endif
-  
-! #if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
-! #  define Z_LARGE
-! #endif
-! 
-! #if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE)
-  #  include <unistd.h>       /* for SEEK_* and off_t */
-  #  ifdef VMS
-  #    include <unixio.h>     /* for off_t */