diff --git a/manim_slides/utils.py b/manim_slides/utils.py
index 1cdee63e..afc21602 100644
--- a/manim_slides/utils.py
+++ b/manim_slides/utils.py
@@ -33,7 +33,9 @@ def _filter(files: list[Path]) -> Iterator[Path]:
                         "https://github.com/jeertmans/manim-slides/issues/390."
                     )
 
-    with tempfile.NamedTemporaryFile(mode="w", suffix=".txt", delete=False) as f:
+    with tempfile.NamedTemporaryFile(
+        mode="w", suffix=".txt", delete=False, encoding="utf-8"
+    ) as f:
         f.writelines(f"file '{file}'\n" for file in _filter(files))
         tmp_file = f.name