diff --git a/libraries/LittleFS/src/LittleFS.cpp b/libraries/LittleFS/src/LittleFS.cpp
index f23a3cfe611..f20b4f16b4c 100644
--- a/libraries/LittleFS/src/LittleFS.cpp
+++ b/libraries/LittleFS/src/LittleFS.cpp
@@ -81,7 +81,9 @@ bool LittleFSFS::begin(bool formatOnFail, const char * basePath, uint8_t maxOpen
     esp_vfs_littlefs_conf_t conf = {
       .base_path = basePath,
       .partition_label = partitionLabel_,
+      .partition = NULL,
       .format_if_mount_failed = false,
+      .read_only = false,
       .dont_mount = false,
       .grow_on_mount = true
     };
diff --git a/libraries/SD/src/sd_diskio.cpp b/libraries/SD/src/sd_diskio.cpp
index f6a8df5e42b..1de4dd70078 100644
--- a/libraries/SD/src/sd_diskio.cpp
+++ b/libraries/SD/src/sd_diskio.cpp
@@ -818,7 +818,7 @@ bool sdcard_mount(uint8_t pdrv, const char* path, uint8_t max_files, bool format
             }
             //FRESULT f_mkfs (const TCHAR* path, const MKFS_PARM* opt, void* work, UINT len);
             const MKFS_PARM opt = {(BYTE)FM_ANY, 0, 0, 0, 0};
-            res = f_mkfs(drv, &opt, work, sizeof(work));
+            res = f_mkfs(drv, &opt, work, sizeof(BYTE) * FF_MAX_SS);
             free(work);
             if (res != FR_OK) {
                 log_e("f_mkfs failed: %s", fferr2str[res]);