diff --git a/narwhals/_arrow/dataframe.py b/narwhals/_arrow/dataframe.py
index 6f8cd0990..428e83e3b 100644
--- a/narwhals/_arrow/dataframe.py
+++ b/narwhals/_arrow/dataframe.py
@@ -183,9 +183,9 @@ def __getitem__(
 
             # PyArrow columns are always strings
             col_name = item[1] if isinstance(item[1], str) else self.columns[item[1]]
-            if isinstance(item[0], str):
-                msg = "Can not slice with tuple with the first element as a str"  # pragma: no cover
-                raise TypeError(msg)  # pragma: no cover
+            if isinstance(item[0], str):  # pragma: no cover
+                msg = "Can not slice with tuple with the first element as a str"
+                raise TypeError(msg)
             if (isinstance(item[0], slice)) and (item[0] == slice(None)):
                 return ArrowSeries(
                     self._native_frame[col_name],