1 files changed, 1 insertions, 0 deletions
diff --git a/py/obj.h b/py/obj.h
index 6bb264c1c3..8b835b28ee 100644
--- a/py/obj.h
+++ b/py/obj.h
@@ -292,6 +292,7 @@ extern const mp_obj_type_t mp_type_module;
 extern const mp_obj_type_t mp_type_staticmethod;
 extern const mp_obj_type_t mp_type_classmethod;
 extern const mp_obj_type_t mp_type_property;
+extern const mp_obj_type_t mp_type_stringio;
 
 // Exceptions
 extern const mp_obj_type_t mp_type_BaseException;