diff --git a/pkgs/development/interpreters/python/wrapper.nix b/pkgs/development/interpreters/python/wrapper.nix
index 65b949661b0..71e9e614352 100644
--- a/pkgs/development/interpreters/python/wrapper.nix
+++ b/pkgs/development/interpreters/python/wrapper.nix
@@ -6,8 +6,7 @@
 # Create a python executable that knows about additional packages.
 let
   recursivePthLoader = import ../../python-modules/recursive-pth-loader/default.nix { stdenv = stdenv; python = python; };
-  env = (
-  let
+  env = let
     paths = stdenv.lib.closePropagation (extraLibs ++ [ python recursivePthLoader ] ) ;
   in buildEnv {
     name = "${python.name}-env";
@@ -36,19 +35,21 @@ let
       done
     '' + postBuild;
 
-    passthru.env = stdenv.mkDerivation {
-      name = "interactive-${python.name}-environment";
-      nativeBuildInputs = [ env ];
-
-      buildCommand = ''
-        echo >&2 ""
-        echo >&2 "*** Python 'env' attributes are intended for interactive nix-shell sessions, not for building! ***"
-        echo >&2 ""
-        exit 1
-      '';
-    };
-  }) // {
-    inherit python;
     inherit (python) meta;
+
+    passthru = python.passthru // {
+      interpreter = "${env}/bin/${python.executable}";
+      env = stdenv.mkDerivation {
+        name = "interactive-${python.name}-environment";
+        nativeBuildInputs = [ env ];
+
+        buildCommand = ''
+          echo >&2 ""
+          echo >&2 "*** Python 'env' attributes are intended for interactive nix-shell sessions, not for building! ***"
+          echo >&2 ""
+          exit 1
+        '';
+    };
+    };
   };
 in env