diff --git a/pkgs/tools/networking/mosh/default.nix b/pkgs/tools/networking/mosh/default.nix
index 59ff89547f2e..ec2f8d78dc67 100644
--- a/pkgs/tools/networking/mosh/default.nix
+++ b/pkgs/tools/networking/mosh/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, zlib, boost, protobuf, ncurses, pkgconfig, IOTty
-, makeWrapper, perl, openssl, autoreconfHook }:
+, makeWrapper, perl, openssl }:
 
 stdenv.mkDerivation rec {
   name = "mosh-1.2.5";
@@ -9,19 +9,10 @@ stdenv.mkDerivation rec {
     sha256 = "1qsb0y882yfgwnpy6f98pi5xqm6kykdsrxzvaal37hs7szjhky0s";
   };
 
-  buildInputs = [
-    boost protobuf ncurses zlib pkgconfig IOTty makeWrapper perl openssl
-  ] ++ stdenv.lib.optional stdenv.isDarwin autoreconfHook;
-
-  prePatch = stdenv.lib.optionalString stdenv.isDarwin ''
-    # look for forkpty in libSystem, not libutil
-    substituteInPlace configure.ac \
-      --replace '[util]' '[System]' \
-      --replace 'LIBUTIL="-lutil"' 'LIBUTIL="-lSystem"'
-  '';
+  buildInputs = [ boost protobuf ncurses zlib pkgconfig IOTty makeWrapper perl openssl ];
 
   postInstall = ''
-    wrapProgram $out/bin/mosh --prefix PERL5LIB : $PERL5LIB
+      wrapProgram $out/bin/mosh --prefix PERL5LIB : $PERL5LIB
   '';
 
   meta = {