diff --git a/pkgs/applications/version-management/mercurial/default.nix b/pkgs/applications/version-management/mercurial/default.nix
index 4623765bd328..066e0a5f137e 100644
--- a/pkgs/applications/version-management/mercurial/default.nix
+++ b/pkgs/applications/version-management/mercurial/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, python3Packages, makeWrapper, gettext
+{ lib, stdenv, fetchurl, fetchpatch, python3Packages, makeWrapper, gettext
 , rustSupport ? stdenv.hostPlatform.isLinux, rustPlatform
 , guiSupport ? false, tk ? null
 , ApplicationServices
@@ -16,6 +16,19 @@ in python3Packages.buildPythonApplication rec {
     sha256 = "17rhlmmkqz5ll3k68jfzpcifg3nndbcbc2nx7kw8xn3qcj7nlpgw";
   };
 
+  patches = [
+    # https://phab.mercurial-scm.org/D10638, needed for below patch to apply
+    (fetchpatch {
+      url = "https://phab.mercurial-scm.org/file/data/oymk4awh2dd7q6cwjbzu/PHID-FILE-bfcr7qrp5spg42wspxpd/D10638.diff";
+      sha256 = "0mfi324is02l7cnd3j0gbmg5rpyyqn3afg3f73flnfwmz5njqa5f";
+    })
+    # https://phab.mercurial-scm.org/D10639, fixes https://bz.mercurial-scm.org/show_bug.cgi?id=6514
+    (fetchpatch {
+      url = "https://phab.mercurial-scm.org/file/data/re4uqdhtknjiacx2ogwu/PHID-FILE-4m26id65dno5gzix2ngh/D10639.diff";
+      sha256 = "0h5ilrd2x1789fr6sf4k1mcvxdh0xdyr94yawdacw87v3x12c8cb";
+    })
+  ];
+
   format = "other";
 
   passthru = { inherit python; }; # pass it so that the same version can be used in hg2git