diff --git a/mojo/stdlib/src/builtin/range.mojo b/mojo/stdlib/src/builtin/range.mojo
index f818180938..ce7ed7f9a0 100644
--- a/mojo/stdlib/src/builtin/range.mojo
+++ b/mojo/stdlib/src/builtin/range.mojo
@@ -691,9 +691,9 @@ fn iter[
     T: CollectionElement
 ](value: Span[T]) -> _SpanIter[
     T,
-    origin,
-    address_space=address_space,
-    alignment=alignment,
+    __type_of(value).origin,
+    address_space = __type_of(value).address_space,
+    alignment = __type_of(value).alignment,
 ]:
     """Return an iterator.
 
diff --git a/mojo/stdlib/src/builtin/reversed.mojo b/mojo/stdlib/src/builtin/reversed.mojo
index 46e3f9bdd7..ab327ae161 100644
--- a/mojo/stdlib/src/builtin/reversed.mojo
+++ b/mojo/stdlib/src/builtin/reversed.mojo
@@ -209,10 +209,10 @@ fn reversed[
     T: CollectionElement
 ](value: Span[T]) -> _SpanIter[
     T,
-    origin,
+    __type_of(value).origin,
     forward=False,
-    address_space=address_space,
-    alignment=alignment,
+    address_space = __type_of(value).address_space,
+    alignment = __type_of(value).alignment,
 ]:
     """Get a reversed iterator of the input Span.