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-rw-r--r--py/builtin.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/py/builtin.h b/py/builtin.h
index 361cef604e..425cfec097 100644
--- a/py/builtin.h
+++ b/py/builtin.h
@@ -81,5 +81,10 @@ extern const mp_obj_module_t mp_module_struct;
extern const mp_obj_module_t mp_module_sys;
extern const mp_obj_module_t mp_module_gc;
+struct _dummy_t;
+extern struct _dummy_t mp_sys_stdin_obj;
+extern struct _dummy_t mp_sys_stdout_obj;
+extern struct _dummy_t mp_sys_stderr_obj;
+
// extmod modules
extern const mp_obj_module_t mp_module_uctypes;