diff --git a/lenskit/lenskit/data/types.py b/lenskit/lenskit/data/types.py
index 6ddcd86ca..566c64445 100644
--- a/lenskit/lenskit/data/types.py
+++ b/lenskit/lenskit/data/types.py
@@ -79,7 +79,7 @@ def create(cls, x: UITuple[T] | tuple[T, T] | T) -> UITuple[T]:
             """
             if isinstance(x, UITuple):
                 return cast(UITuple[T], x)
-            elif isinstance(x, tuple):
+            elif isinstance(x, (tuple, list)):
                 u, i = cast(tuple[T, T], x)
                 return UITuple(u, i)
             else: