diff --git a/flamenco_worker/commands.py b/flamenco_worker/commands.py
index 6f08fc91a672b9bd89667e1312ee0e9da28a9e60..2827c511bc711102a8c8c23ecfa8d3a379f80cb7 100644
--- a/flamenco_worker/commands.py
+++ b/flamenco_worker/commands.py
@@ -775,7 +775,7 @@ class BlenderRenderCommand(AbstractSubprocessCommand):
 
                 cmd.extend([
                     '--python-exit-code', '42',
-                    '--python', override_filename,
+                    '--python', override_filepath.as_posix(),
                 ])
 
         if settings.get('python_expr'):