diff --git a/pkgs/tools/system/which/default.nix b/pkgs/tools/system/which/default.nix
index 482d495ba83..3552766020e 100644
--- a/pkgs/tools/system/which/default.nix
+++ b/pkgs/tools/system/which/default.nix
@@ -1,9 +1,11 @@
-{stdenv, fetchurl}: stdenv.mkDerivation {
-  name = "which-2.17";
+{stdenv, fetchurl, readline}: stdenv.mkDerivation {
+  name = "which-2.19";
   src = fetchurl {
-    url = http://ftp.gnu.org/gnu/which/which-2.17.tar.gz;
-    sha256 = "1nnnbn83da8481blmcyv96gm15ccsilr93fmgmwdlzj8a72fjvqp";
+    url = mirror://gnu/pub/gnu/which/which-2.19.tar.gz;
+    sha256 = "0lnd8mfpc0r1r2ch54vl3vc6r0fnzfl33sqdda2aq62iyrsbhybx";
   };
+
+  buildInputs = [readline];
 }
 
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 22bbc65cd41..faca8a7f320 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -819,7 +819,7 @@ rec {
   };
 
   which = import ../tools/system/which {
-    inherit fetchurl stdenv;
+    inherit fetchurl stdenv readline;
   };
 
   wv = import ../tools/misc/wv {