diff --git a/pkgs/development/python-modules/marshmallow-polyfield/default.nix b/pkgs/development/python-modules/marshmallow-polyfield/default.nix
index 5230a614c6b1..b6d3df57aea0 100644
--- a/pkgs/development/python-modules/marshmallow-polyfield/default.nix
+++ b/pkgs/development/python-modules/marshmallow-polyfield/default.nix
@@ -35,6 +35,8 @@ buildPythonPackage rec {
   pythonImportsCheck = [ "marshmallow" ];
 
   meta = with lib; {
+    # https://github.com/Bachmann1234/marshmallow-polyfield/issues/45
+    broken = true;
     description = "Extension to Marshmallow to allow for polymorphic fields";
     homepage = "https://github.com/Bachmann1234/marshmallow-polyfield";
     license = licenses.asl20;