diff --git a/pyproject.toml b/pyproject.toml
index 75fd1e19521..99399a2cce5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -86,7 +86,10 @@ exclude_lines = ["pragma: no cover", "if TYPE_CHECKING"]
 
 [tool.mypy]
 enable_error_code = "redundant-self"
-exclude = 'xarray/util/generate_.*\.py'
+exclude = [
+  'xarray/util/generate_.*\.py',
+  'xarray/datatree_/doc/.*\.py',
+]
 files = "xarray"
 show_error_codes = true
 show_error_context = true