diff --git a/ms2rescore/feature_generators/im2deep.py b/ms2rescore/feature_generators/im2deep.py
index 552b728..772f685 100644
--- a/ms2rescore/feature_generators/im2deep.py
+++ b/ms2rescore/feature_generators/im2deep.py
@@ -88,7 +88,7 @@ def add_features(self, psm_list: PSMList) -> None:
 
                 # Disable wild logging to stdout by TensorFlow, unless in debug mode
                 with (
-                    contextlib.redirect_stdout(open(os.devnull, "w"))
+                    contextlib.redirect_stdout(open(os.devnull, "w", encoding="utf-8"))
                     if not self._verbose
                     else contextlib.nullcontext()
                 ):