1 files changed, 2 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/python-modules/sphinxcontrib-mscgen/default.nix b/nixpkgs/pkgs/development/python-modules/sphinxcontrib-mscgen/default.nix
index 0a283dd81a4d..7350b837a7f8 100644
--- a/nixpkgs/pkgs/development/python-modules/sphinxcontrib-mscgen/default.nix
+++ b/nixpkgs/pkgs/development/python-modules/sphinxcontrib-mscgen/default.nix
@@ -30,6 +30,8 @@ buildPythonPackage rec {
     "sphinxcontrib.mscgen"
   ];
 
+  pythonNamespaces = [ "sphinxcontrib" ];
+
   meta = with lib; {
     description = "Sphinx extension using mscgen to render diagrams";
     homepage = "https://github.com/sphinx-contrib/mscgen";