diff --git a/pkgs/development/python-modules/sh/default.nix b/pkgs/development/python-modules/sh/default.nix
index 964386564e45..aa18f07e49e5 100644
--- a/pkgs/development/python-modules/sh/default.nix
+++ b/pkgs/development/python-modules/sh/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, buildPythonPackage, fetchPypi, python, coverage, lsof, glibcLocales }:
+{ stdenv, buildPythonPackage, fetchPypi, fetchpatch, python, coverage, lsof, glibcLocales }:
 
 buildPythonPackage rec {
   pname = "sh";
@@ -9,9 +9,17 @@ buildPythonPackage rec {
     sha256 = "1z2hx357xp3v4cv44xmqp7lli3frndqpyfmpbxf7n76h7s1zaaxm";
   };
 
-  # Disable tests that fail on Darwin
-  # Some of the failures are due to Nix using GNU coreutils
-  patches = [ ./disable-broken-tests-darwin.patch ];
+  patches = [
+    # Disable tests that fail on Darwin
+    # Some of the failures are due to Nix using GNU coreutils
+    ./disable-broken-tests-darwin.patch
+    # Fix tests for Python 3.7. See: https://github.com/amoffat/sh/pull/468
+    (fetchpatch {
+      url = "https://github.com/amoffat/sh/commit/b6202f75706473f02084d819e0765056afa43664.patch";
+      sha256 = "1kzxyxcc88zhgn2kmfg9yrbs4n405b2jq7qykb453l52hy10vi94";
+      excludes = [ ".travis.yml" ];
+    })
+  ];
 
   postPatch = ''
     sed -i 's#/usr/bin/env python#${python.interpreter}#' test.py