diff --git a/manimlib/scene/scene.py b/manimlib/scene/scene.py
index 72dde6a4..b3135cf0 100644
--- a/manimlib/scene/scene.py
+++ b/manimlib/scene/scene.py
@@ -720,7 +720,7 @@ class Scene(Container):
         with open(file_list, 'w') as fp:
             for pf_path in partial_movie_files:
                 if os.name == 'nt':
-                    fp_path = fp_path.replace('\\', '/')
+                    pf_path = pf_path.replace('\\', '/')
 
                 fp.write("file {}\n".format(pf_path))