diff --git a/nixos/modules/services/web-servers/uwsgi.nix b/nixos/modules/services/web-servers/uwsgi.nix
index 14596bb3add0..356b896a6dc9 100644
--- a/nixos/modules/services/web-servers/uwsgi.nix
+++ b/nixos/modules/services/web-servers/uwsgi.nix
@@ -31,9 +31,7 @@ let
         inherit python;
       };
 
-      penv = python.buildEnv.override {
-        extraLibs = (c.pythonPackages or (self: [])) pythonPackages;
-      };
+      pythonEnv = python.withPackages (c.pythonPackages or (self: []));
 
       uwsgiCfg = {
         uwsgi =
@@ -42,7 +40,7 @@ let
               inherit plugins;
             } // removeAttrs c [ "type" "pythonPackages" ]
               // optionalAttrs (python != null) {
-                pythonpath = "${penv}/${python.sitePackages}";
+                pythonpath = "${pythonEnv}/${python.sitePackages}";
                 env =
                   # Argh, uwsgi expects list of key-values there instead of a dictionary.
                   let env' = c.env or [];
@@ -51,7 +49,7 @@ let
                            then substring (stringLength "PATH=") (stringLength x) x
                            else null;
                       oldPaths = filter (x: x != null) (map getPath env');
-                  in env' ++ [ "PATH=${optionalString (oldPaths != []) "${last oldPaths}:"}${penv}/bin" ];
+                  in env' ++ [ "PATH=${optionalString (oldPaths != []) "${last oldPaths}:"}${pythonEnv}/bin" ];
               }
           else if c.type == "emperor"
             then {
diff --git a/pkgs/servers/web-apps/klaus/default.nix b/pkgs/development/python-modules/klaus/default.nix
similarity index 95%
rename from pkgs/servers/web-apps/klaus/default.nix
rename to pkgs/development/python-modules/klaus/default.nix
index 81d1e57e7a04..0740cfa84bb7 100644
--- a/pkgs/servers/web-apps/klaus/default.nix
+++ b/pkgs/development/python-modules/klaus/default.nix
@@ -1,6 +1,6 @@
 { lib, python, fetchFromGitHub }:
 
-python.pkgs.buildPythonApplication rec {
+python.pkgs.buildPythonPackage rec {
   pname = "klaus";
   version = "1.2.2";
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index dcfc3646bcc6..cf5f480ec3a6 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1339,7 +1339,7 @@ with pkgs;
 
   kisslicer = callPackage ../tools/misc/kisslicer { };
 
-  klaus = callPackage ../servers/web-apps/klaus { };
+  klaus = with pythonPackages; toPythonApplication klaus;
 
   lcdproc = callPackage ../servers/monitoring/lcdproc { };
 
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 9f0a0f45b12d..a3a80f998f7a 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -6929,6 +6929,8 @@ in {
 
   kiwisolver = callPackage ../development/python-modules/kiwisolver { };
 
+  klaus = callPackage ../development/python-modules/klaus {};
+
   klein = callPackage ../development/python-modules/klein { };
 
   koji = callPackage ../development/python-modules/koji { };