diff --git a/src/textual/scroll_view.py b/src/textual/scroll_view.py
index 416722874..0fc2a4cc9 100644
--- a/src/textual/scroll_view.py
+++ b/src/textual/scroll_view.py
@@ -76,7 +76,7 @@ class ScrollView(Widget):
             self._size = size
             virtual_size = self.virtual_size
             self._scroll_update(virtual_size)
-            self._container_size = size
+            self._container_size = size - self.styles.gutter.totals
             self.scroll_to(self.scroll_x, self.scroll_y, animate=False)
             self.refresh()
 
diff --git a/src/textual/widgets/_data_table.py b/src/textual/widgets/_data_table.py
index 322756c4d..8cc67cc21 100644
--- a/src/textual/widgets/_data_table.py
+++ b/src/textual/widgets/_data_table.py
@@ -269,9 +269,10 @@ class DataTable(ScrollView, Generic[CellType], can_focus=True):
                 column.content_width = max(column.content_width, content_width)
 
         total_width = sum(column.render_width for column in self.columns)
+        header_height = self.header_height if self.show_header else 0
         self.virtual_size = Size(
             total_width,
-            max(len(self._y_offsets), (self.header_height if self.show_header else 0)),
+            len(self._y_offsets) + header_height,
         )
 
     def _get_cell_region(self, row_index: int, column_index: int) -> Region: