diff --git a/py/gc_long_lived.c b/py/gc_long_lived.c
index a2b5d88e01..0e94390e9d 100755
--- a/py/gc_long_lived.c
+++ b/py/gc_long_lived.c
@@ -85,8 +85,6 @@ mp_obj_property_t *make_property_long_lived(mp_obj_property_t *prop, uint8_t max
     return gc_make_long_lived(prop);
 }
 
-extern const mp_obj_dict_t mcu_module_globals;
-
 mp_obj_dict_t *make_dict_long_lived(mp_obj_dict_t *dict, uint8_t max_depth) {
     #ifndef MICROPY_ENABLE_GC
     return dict;