diff --git a/src/drivers/px4io/CMakeLists.txt b/src/drivers/px4io/CMakeLists.txt
index 1cf4809fc6..b5b9881cb8 100644
--- a/src/drivers/px4io/CMakeLists.txt
+++ b/src/drivers/px4io/CMakeLists.txt
@@ -59,6 +59,7 @@ ExternalProject_Add(px4io_firmware
 	INSTALL_COMMAND ""
 	USES_TERMINAL_BUILD true
 	DEPENDS git_nuttx git_nuttx_apps
+	BUILD_ALWAYS 1
 )
 
 ExternalProject_Get_Property(px4io_firmware BINARY_DIR)