diff --git a/boards/omnibus/f4sd/default.cmake b/boards/omnibus/f4sd/default.cmake
index 0407dfdab1..d8baca39e3 100644
--- a/boards/omnibus/f4sd/default.cmake
+++ b/boards/omnibus/f4sd/default.cmake
@@ -6,6 +6,7 @@ px4_add_board(
 	TOOLCHAIN arm-none-eabi
 	ARCHITECTURE cortex-m4
 	ROMFSROOT px4fmu_common
+	CONSTRAINED_FLASH
 	SERIAL_PORTS
 		TEL2:/dev/ttyS1
 		URT6:/dev/ttyS2