1 files changed, 2 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/python-modules/sphinxcontrib-actdiag/default.nix b/nixpkgs/pkgs/development/python-modules/sphinxcontrib-actdiag/default.nix
index 32470e98b4e0..bfe5739b2a7b 100644
--- a/nixpkgs/pkgs/development/python-modules/sphinxcontrib-actdiag/default.nix
+++ b/nixpkgs/pkgs/development/python-modules/sphinxcontrib-actdiag/default.nix
@@ -29,6 +29,8 @@ buildPythonPackage rec {
     "sphinxcontrib.actdiag"
   ];
 
+  pythonNamespaces = [ "sphinxcontrib" ];
+
   meta = with lib; {
     description = "Sphinx actdiag extension";
     homepage = "https://github.com/blockdiag/sphinxcontrib-actdiag";