diff --git a/stdlib/src/builtin/range.mojo b/stdlib/src/builtin/range.mojo
index 972d446a41..40e9fe8536 100644
--- a/stdlib/src/builtin/range.mojo
+++ b/stdlib/src/builtin/range.mojo
@@ -731,7 +731,7 @@ fn iter[
     V: CollectionElement,
 ](
     ref [_]value: _DictEntryIter[K, V, *_],
-    out output: DictEntryIter[K, V, __type_of(value).dict_origin],
+    out output: _DictEntryIter[K, V, __type_of(value).dict_origin],
 ):
     """Get an iterator of the input dict items.
 
diff --git a/stdlib/src/collections/string/string.mojo b/stdlib/src/collections/string/string.mojo
index 890be23a13..fb67a7c184 100644
--- a/stdlib/src/collections/string/string.mojo
+++ b/stdlib/src/collections/string/string.mojo
@@ -1274,7 +1274,7 @@ struct String(
         """
         return self.as_string_slice().chars()
 
-    fn char_slices(self) -> _StringSliceIter[__origin_of(self)]:
+    fn char_slices(ref self) -> _StringSliceIter[__origin_of(self)]:
         """Returns an iterator over single-character slices of this string.
 
         Each returned slice points to a single Unicode codepoint encoded in the