diff --git a/pkgs/development/python-modules/hglib/default.nix b/pkgs/development/python-modules/hglib/default.nix
index eab8ffe2bfd..14e5b4edcd7 100644
--- a/pkgs/development/python-modules/hglib/default.nix
+++ b/pkgs/development/python-modules/hglib/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, buildPythonPackage, fetchPypi, substituteAll, python, nose, mercurial }:
+{ stdenv, buildPythonPackage, fetchPypi, fetchpatch, substituteAll, python, nose, mercurial }:
 
 buildPythonPackage rec {
   pname = "python-hglib";
@@ -14,12 +14,24 @@ buildPythonPackage rec {
       src = ./hgpath.patch;
       hg = "${mercurial}/bin/hg";
     })
+
+    # These two patches are needed to fix the tests.
+    # They will need to be removed on the next update.
+    (fetchpatch {
+      url = "https://www.mercurial-scm.org/repo/python-hglib/raw-rev/12e6aaef0f6e";
+      sha256 = "159pmhy23gqcc6rkh5jrni8fba4xbhxwcc0jf02wqr7f82kv8a7x";
+    })
+    (fetchpatch {
+      url = "https://www.mercurial-scm.org/repo/python-hglib/raw-rev/1a318162f06f";
+      sha256 = "04lxfc15m3yw5kvp133xg8zv09l8kndi146xk3lnbbm07fgcnn1z";
+    })
   ];
 
   checkInputs = [ nose ];
 
   checkPhase = ''
-    ${python.interpreter} test.py --with-hg "${mercurial}/bin/hg"
+    ${python.interpreter} test.py --with-hg "${mercurial}/bin/hg" -v \
+      --exclude=test_merge_prompt_cb # https://bz.mercurial-scm.org/show_bug.cgi?id=6265
   '';
 
   meta = with stdenv.lib; {