diff --git a/narwhals/_pandas_like/series.py b/narwhals/_pandas_like/series.py
index 25486f54f..74e1c492d 100644
--- a/narwhals/_pandas_like/series.py
+++ b/narwhals/_pandas_like/series.py
@@ -619,7 +619,9 @@ def quantile(
 
     def zip_with(self: Self, mask: Any, other: Any) -> PandasLikeSeries:
         ser = self._native_series
-        mask = validate_column_comparand(ser.index, mask, broadcast_length_one=False)
+        mask = validate_column_comparand(
+            ser.index, mask, treat_length_one_as_scalar=False
+        )
         other = validate_column_comparand(ser.index, other)
         res = ser.where(mask, other)
         return self._from_native_series(res)
diff --git a/narwhals/_pandas_like/utils.py b/narwhals/_pandas_like/utils.py
index e24e6d4c4..88e61b32a 100644
--- a/narwhals/_pandas_like/utils.py
+++ b/narwhals/_pandas_like/utils.py
@@ -30,7 +30,7 @@
 
 
 def validate_column_comparand(
-    index: Any, other: Any, *, broadcast_length_one: bool = True
+    index: Any, other: Any, *, treat_length_one_as_scalar: bool = True
 ) -> Any:
     """Validate RHS of binary operation.
 
@@ -52,7 +52,7 @@ def validate_column_comparand(
     if isinstance(other, PandasLikeDataFrame):
         return NotImplemented
     if isinstance(other, PandasLikeSeries):
-        if other.len() == 1 and broadcast_length_one:
+        if other.len() == 1 and treat_length_one_as_scalar:
             # broadcast
             return other.item()
         if other._native_series.index is not index: