diff --git a/pkgs/development/python-modules/xdot/default.nix b/pkgs/development/python-modules/xdot/default.nix
index fa24256b6a0..a07235006c9 100644
--- a/pkgs/development/python-modules/xdot/default.nix
+++ b/pkgs/development/python-modules/xdot/default.nix
@@ -1,4 +1,4 @@
-{ lib, buildPythonPackage, fetchPypi, isPy3k, python3, xvfb-run
+{ lib, buildPythonPackage, fetchPypi, isPy3k, python, xvfb-run
 , wrapGAppsHook, gobject-introspection, pygobject3, graphviz, gtk3, numpy }:
 
 buildPythonPackage rec {
@@ -20,7 +20,7 @@ buildPythonPackage rec {
   '';
 
   checkPhase = ''
-    xvfb-run -s '-screen 0 800x600x24' ${python3.interpreter} nix_run_setup test
+    xvfb-run -s '-screen 0 800x600x24' ${python.interpreter} nix_run_setup test
   '';
 
   # https://github.com/NixOS/nixpkgs/pull/107872#issuecomment-752175866