diff --git a/torchgeo/datasets/geo.py b/torchgeo/datasets/geo.py
index 7a79923d95b..09564dbaba1 100644
--- a/torchgeo/datasets/geo.py
+++ b/torchgeo/datasets/geo.py
@@ -434,7 +434,7 @@ def files(self) -> set[str]:
         """
         # Make iterable
         if isinstance(self.paths, str):
-            paths = [self.paths]
+            paths: Iterable[str] = [self.paths]
         else:
             paths = self.paths