diff --git a/pkgs/development/python-modules/kombu/default.nix b/pkgs/development/python-modules/kombu/default.nix
index ee023a5e34bc..28b9a3f840de 100644
--- a/pkgs/development/python-modules/kombu/default.nix
+++ b/pkgs/development/python-modules/kombu/default.nix
@@ -25,6 +25,11 @@ buildPythonPackage rec {
     hash = "sha256-N87j7nJflOqLsXPqq3wXYCA+pTu+uuImMoYA+dJ5lhA=";
   };
 
+  postPatch = ''
+    substituteInPlace requirements/test.txt \
+      --replace "pytz>dev" "pytz"
+  '';
+
   propagatedBuildInputs = [
     amqp
     vine