diff --git a/pkgs/tools/security/mkpasswd/default.nix b/pkgs/tools/security/mkpasswd/default.nix
index 624fcdbe6c6a0..b18ef0d1d54b4 100644
--- a/pkgs/tools/security/mkpasswd/default.nix
+++ b/pkgs/tools/security/mkpasswd/default.nix
@@ -1,16 +1,18 @@
-{ stdenv, fetchurl
+{ stdenv, fetchurl, perl
 }:
   
 stdenv.mkDerivation rec {
   name = "mkpasswd-${version}";
 
-  version = "5.1.1";
+  version = "5.1.2";
 
   src = fetchurl {
     url = "http://ftp.debian.org/debian/pool/main/w/whois/whois_${version}.tar.xz";
-    sha256 = "0i06a9mb9qcq272782mg6dffv3k7bqkw4cdr31yrc0s6jqylryv9";
+    sha256 = "00sl19b1p8l3gvdrx8lwvib0pcpfw8v0n8crw9lsabvp1s8pc7q2";
   };
 
+  buildInputs = [ perl ];
+
   preConfigure = ''
     substituteInPlace Makefile --replace "prefix = /usr" "prefix = $out"
   '';