diff --git a/pkgs/development/python-modules/mlflow/default.nix b/pkgs/development/python-modules/mlflow/default.nix
index 4687b97284f..4d65d7fce43 100644
--- a/pkgs/development/python-modules/mlflow/default.nix
+++ b/pkgs/development/python-modules/mlflow/default.nix
@@ -66,5 +66,7 @@ buildPythonPackage rec {
     description = "Open source platform for the machine learning lifecycle";
     license = licenses.asl20;
     maintainers = with maintainers; [ tbenst ];
+    # missing prometheus-flask-exporter, not packaged in nixpkgs
+    broken = true; # 2020-08-15
   };
 }