diff --git a/boards/px4/fmu-v6x/nuttx-config/nsh/defconfig b/boards/px4/fmu-v6x/nuttx-config/nsh/defconfig
index b33e7b576d..bc83706190 100644
--- a/boards/px4/fmu-v6x/nuttx-config/nsh/defconfig
+++ b/boards/px4/fmu-v6x/nuttx-config/nsh/defconfig
@@ -92,7 +92,6 @@ CONFIG_MEMSET_OPTSPEED=y
 CONFIG_MMCSD=y
 CONFIG_MMCSD_SDIO=y
 CONFIG_MMCSD_SDIOWAIT_WRCOMPLETE=y
-CONFIG_MM_REGIONS=3
 CONFIG_MTD=y
 CONFIG_MTD_BYTE_WRITE=y
 CONFIG_MTD_PARTITION=y