diff --git a/pkgs/tools/admin/azure-cli/python-packages.nix b/pkgs/tools/admin/azure-cli/python-packages.nix
index f0bebeed679..4cf0a5d3554 100644
--- a/pkgs/tools/admin/azure-cli/python-packages.nix
+++ b/pkgs/tools/admin/azure-cli/python-packages.nix
@@ -37,6 +37,11 @@ let
         substituteInPlace setup.cfg \
           --replace "azure-namespace-package = azure-mgmt-nspkg" ""
       '';
+
+      # force PEP420
+      postInstall = ''
+        rm -f $out/${py.sitePackages}/azure/{,mgmt/}__init__.py
+      '';
     });
 
   py = python.override {