diff --git a/asdf/core/_converters/integer.py b/asdf/core/_converters/integer.py
index 9ca5966c7..61ddf882d 100644
--- a/asdf/core/_converters/integer.py
+++ b/asdf/core/_converters/integer.py
@@ -24,7 +24,7 @@ def to_yaml_tree(self, obj, tag, ctx):
         array = np.array(words, dtype=np.uint32)
 
         tree = {}
-        ctx._blocks._set_array_storage(array, obj._storage)
+        ctx.set_array_storage(array, obj._storage)
         tree["words"] = array
         tree["sign"] = obj._sign
         tree["string"] = str(int(obj._value))