diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 0d51996499d8..f12d2273c47e 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -2159,6 +2159,22 @@ let
       platforms = platforms.all;
     };
   };
+  
+  cytoolz = buildPythonPackage rec {
+    name = "cytoolz-${version}";
+    version = "0.7.3";
+    
+    src = pkgs.fetchurl{
+      url = "https://pypi.python.org/packages/source/c/cytoolz/cytoolz-${version}.tar.gz";
+      md5 = "e9f0441d9f340a23c60357f68f25d163";
+    };
+    
+    meta = {
+      homepage = "http://github.com/pytoolz/cytoolz/";
+      description = "Cython implementation of Toolz: High performance functional utilities";
+      license = "licenses.bsd3";   
+    };
+  };
 
   cryptacular = buildPythonPackage rec {
     name = "cryptacular-1.4.1";