diff --git a/src/drivers/boards/auav-x21/CMakeLists.txt b/src/drivers/boards/auav-x21/CMakeLists.txt
index a4fcebd50f..6c12ec0a74 100644
--- a/src/drivers/boards/auav-x21/CMakeLists.txt
+++ b/src/drivers/boards/auav-x21/CMakeLists.txt
@@ -38,6 +38,7 @@ px4_add_module(
 		../common/board_dma_alloc.c
 		../common/stm32/board_reset.c
 		../common/stm32/board_identity.c
+		../common/stm32/board_mcu_version.c
 		auav_can.c
 		auav_init.c
 		auav_timer_config.c