diff --git a/mesonpy/__init__.py b/mesonpy/__init__.py
index b0ed1eac..476957c5 100644
--- a/mesonpy/__init__.py
+++ b/mesonpy/__init__.py
@@ -240,7 +240,7 @@ def __init__(self, name: str, *args: Any, **kwargs: Any):
         super().__init__(name, *args, **kwargs)
 
     @classmethod
-    def from_pyproject(
+    def from_pyproject(  # type: ignore[override]
         cls,
         data: Mapping[str, Any],
         project_dir: Path = os.path.curdir,
@@ -345,7 +345,7 @@ def _libs_dir(self) -> str:
     @property
     def _license_file(self) -> Optional[pathlib.Path]:
         license_ = self._metadata.license
-        if license_:
+        if license_ and isinstance(license_, pyproject_metadata.License):
             return license_.file
         return None