diff --git a/pkgs/development/python-modules/cytoolz/default.nix b/pkgs/development/python-modules/cytoolz/default.nix
index aefe250effec..2b631d053e3e 100644
--- a/pkgs/development/python-modules/cytoolz/default.nix
+++ b/pkgs/development/python-modules/cytoolz/default.nix
@@ -5,6 +5,7 @@
 , nose
 , toolz
 , python
+, fetchpatch
 }:
 
 buildPythonPackage rec {
@@ -16,6 +17,15 @@ buildPythonPackage rec {
     sha256 = "84cc06fa40aa310f2df79dd440fc5f84c3e20f01f9f7783fc9c38d0a11ba00e5";
   };
 
+  patches = [
+    # temporal fix for a test failure: https://github.com/pytoolz/cytoolz/issues/122
+    (fetchpatch {
+      name = "py37.patch";
+      url = https://salsa.debian.org/python-team/modules/python-cytoolz/raw/5ce4158deefc47475d1e76813f900e6c72ddcc6e/debian/patches/py37.patch;
+      sha256 = "1z29y7s5n751q3f74r3bz0f48yg6izvi68hc4pkwcalxmkq5r1n9";
+    })
+  ];
+
   # Extension types
   disabled = isPyPy;
 
@@ -28,9 +38,9 @@ buildPythonPackage rec {
   '';
 
   meta = {
-    homepage = "https://github.com/pytoolz/cytoolz/";
+    homepage = https://github.com/pytoolz/cytoolz/;
     description = "Cython implementation of Toolz: High performance functional utilities";
     license = "licenses.bsd3";
     maintainers = with lib.maintainers; [ fridh ];
   };
-}
\ No newline at end of file
+}