diff --git a/unix/main.c b/unix/main.c
index 9f787595d07a9646c5002eeac8322117d5bb45af..054dd6acb673287e90852535db5e6548a6d6ab4b 100644
--- a/unix/main.c
+++ b/unix/main.c
@@ -455,7 +455,7 @@ int main(int argc, char **argv) {
     #if defined(MICROPY_UNIX_COVERAGE)
     {
         MP_DECLARE_CONST_FUN_OBJ(extra_coverage_obj);
-        mp_store_global(QSTR_FROM_STR_STATIC("extra_coverage"), (mp_obj_t)&extra_coverage_obj);
+        mp_store_global(QSTR_FROM_STR_STATIC("extra_coverage"), MP_OBJ_FROM_PTR(&extra_coverage_obj));
     }
     #endif