diff --git a/test/test_index.py b/test/test_index.py
@@ -174,7 +174,7 @@ def _decode(stdout):
        except UnicodeDecodeError:
            pass
        except LookupError as error:
-            _logger.warning("%s", str(error))  # Message already says "Unknown encoding:".

        # Assume UTF-8. If invalid, substitute Unicode replacement characters.
        return stdout.decode("utf-8", errors="replace")