diff --git a/pkgs/development/python-modules/msgpack/default.nix b/pkgs/development/python-modules/msgpack/default.nix
index 18287c64198..d44166b82f7 100644
--- a/pkgs/development/python-modules/msgpack/default.nix
+++ b/pkgs/development/python-modules/msgpack/default.nix
@@ -4,6 +4,7 @@
 , pytestCheckHook
 , pythonOlder
 , setuptools
+, borgbackup
 }:
 
 buildPythonPackage rec {
@@ -30,6 +31,12 @@ buildPythonPackage rec {
     "msgpack"
   ];
 
+  passthru.tests = {
+    # borgbackup is sensible to msgpack versions: https://github.com/borgbackup/borg/issues/3753
+    # please be mindful before bumping versions.
+    inherit borgbackup;
+  };
+
   meta = with lib;  {
     description = "MessagePack serializer implementation";
     homepage = "https://github.com/msgpack/msgpack-python";