diff --git a/freesurfer_stats/__init__.py b/freesurfer_stats/__init__.py
index c5aeaa8..299e77e 100644
--- a/freesurfer_stats/__init__.py
+++ b/freesurfer_stats/__init__.py
@@ -195,7 +195,7 @@ def read(cls, path: typing.Union[str, pathlib.Path]) -> "CorticalParcellationSta
         ) = pandas.io.common.get_filepath_or_buffer(path)
         # https://github.com/pandas-dev/pandas/blob/v0.25.3/pandas/io/common.py#L171
         # https://github.com/pandas-dev/pandas/blob/v0.21.0/pandas/io/common.py#L171
-        if instructions:
+        if instructions:  # pragma: no cover
             assert len(instructions) == 1, instructions
             should_close = instructions[0]
         else: