diff --git a/boards/atl/mantis-edu/nuttx-config/nsh/defconfig b/boards/atl/mantis-edu/nuttx-config/nsh/defconfig
index a7b260c319..99663e324a 100644
--- a/boards/atl/mantis-edu/nuttx-config/nsh/defconfig
+++ b/boards/atl/mantis-edu/nuttx-config/nsh/defconfig
@@ -87,6 +87,7 @@ 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