diff --git a/tests/bluetooth/mesh/src/microbit.c b/tests/bluetooth/mesh/src/microbit.c
index d3596aab628..fae120297a6 100644
--- a/tests/bluetooth/mesh/src/microbit.c
+++ b/tests/bluetooth/mesh/src/microbit.c
@@ -41,7 +41,7 @@ static void configure_button(void)
 	gpio_add_callback(gpio, &button_cb);
 }
 
-void board_output_number(bt_mesh_output_action_t action, uint32_t number)
+void board_output_number(bt_mesh_output_action_t action, u32_t number)
 {
 	struct mb_display *disp = mb_display_get();
 	struct mb_image arrow = MB_IMAGE({ 0, 0, 1, 0, 0 },