diff --git a/shared-bindings/bitmaptools/__init__.c b/shared-bindings/bitmaptools/__init__.c
index 9aa7362269..7754bf57eb 100644
--- a/shared-bindings/bitmaptools/__init__.c
+++ b/shared-bindings/bitmaptools/__init__.c
@@ -916,10 +916,10 @@ STATIC mp_obj_t bitmaptools_obj_draw_circle(size_t n_args, const mp_obj_t *pos_a
 
     static const mp_arg_t allowed_args[] = {
         {MP_QSTR_dest_bitmap, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL}},
-        {MP_QSTR_x0, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
-        {MP_QSTR_y0, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
-        {MP_QSTR_radius, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
-        {MP_QSTR_value, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
+        {MP_QSTR_x, MP_ARG_REQUIRED | MP_ARG_INT},
+        {MP_QSTR_y, MP_ARG_REQUIRED | MP_ARG_INT},
+        {MP_QSTR_radius, MP_ARG_REQUIRED | MP_ARG_INT},
+        {MP_QSTR_value, MP_ARG_REQUIRED | MP_ARG_INT},
     };
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);