diff --git a/boards/px4/fmu-v5x/nuttx-config/base_phy_DP83848C/defconfig b/boards/px4/fmu-v5x/nuttx-config/base_phy_DP83848C/defconfig
index 012465d70a..fb700f815d 100644
--- a/boards/px4/fmu-v5x/nuttx-config/base_phy_DP83848C/defconfig
+++ b/boards/px4/fmu-v5x/nuttx-config/base_phy_DP83848C/defconfig
@@ -73,6 +73,7 @@ CONFIG_FS_FAT=y
 CONFIG_FS_FATTIME=y
 CONFIG_FS_PROCFS=y
 CONFIG_FS_PROCFS_INCLUDE_PROGMEM=y
+CONFIG_FS_PROCFS_MAX_TASKS=64
 CONFIG_FS_PROCFS_REGISTER=y
 CONFIG_FS_ROMFS=y
 CONFIG_GRAN=y
@@ -90,9 +91,9 @@ CONFIG_IPCFG_PATH="/fs/mtd_net"
 CONFIG_LIBC_FLOATINGPOINT=y
 CONFIG_LIBC_LONG_LONG=y
 CONFIG_LIBC_STRERROR=y
-CONFIG_FS_PROCFS_MAX_TASKS=64
 CONFIG_MEMSET_64BIT=y
 CONFIG_MEMSET_OPTSPEED=y
+CONFIG_MKFATFS_BUFFER_ALIGMENT=32
 CONFIG_MMCSD=y
 CONFIG_MMCSD_SDIO=y
 CONFIG_MMCSD_SDIOWAIT_WRCOMPLETE=y
diff --git a/boards/px4/fmu-v5x/nuttx-config/nsh/defconfig b/boards/px4/fmu-v5x/nuttx-config/nsh/defconfig
index dd5ff905fb..979598997c 100644
--- a/boards/px4/fmu-v5x/nuttx-config/nsh/defconfig
+++ b/boards/px4/fmu-v5x/nuttx-config/nsh/defconfig
@@ -93,6 +93,7 @@ CONFIG_LIBC_LONG_LONG=y
 CONFIG_LIBC_STRERROR=y
 CONFIG_MEMSET_64BIT=y
 CONFIG_MEMSET_OPTSPEED=y
+CONFIG_MKFATFS_BUFFER_ALIGMENT=32
 CONFIG_MMCSD=y
 CONFIG_MMCSD_SDIO=y
 CONFIG_MMCSD_SDIOWAIT_WRCOMPLETE=y