diff --git a/pkgs/development/python-modules/mutagen/default.nix b/pkgs/development/python-modules/mutagen/default.nix
index b5415c51c4cd..f0bd0951d816 100644
--- a/pkgs/development/python-modules/mutagen/default.nix
+++ b/pkgs/development/python-modules/mutagen/default.nix
@@ -33,7 +33,7 @@ buildPythonPackage rec {
   ];
 
   postInstall = ''
-    ${python.interpreter} setup.py build_sphinx --build-dir=$doc
+    ${python.pythonForBuild.interpreter} setup.py build_sphinx --build-dir=$doc
   '';
 
   checkInputs = [