diff --git a/sphinx-key/sdkconfig.defaults b/sphinx-key/sdkconfig.defaults
index b97b1c6..604fef2 100644
--- a/sphinx-key/sdkconfig.defaults
+++ b/sphinx-key/sdkconfig.defaults
@@ -2,6 +2,7 @@
 CONFIG_ESP_MAIN_TASK_STACK_SIZE=64000
 CONFIG_PTHREAD_TASK_STACK_SIZE_DEFAULT=10000
 # CONFIG_LOG_DEFAULT_LEVEL_DEBUG=y
+CONFIG_FATFS_LFN_STACK=y
 
 # Use this to set FreeRTOS kernel tick frequency to 1000 Hz (100 Hz by default).
 # This allows to use 1 ms granuality for thread sleeps (10 ms by default).
diff --git a/sphinx-key/src/core/events.rs b/sphinx-key/src/core/events.rs
index c28639b..b9b3d50 100644
--- a/sphinx-key/src/core/events.rs
+++ b/sphinx-key/src/core/events.rs
@@ -99,7 +99,7 @@ pub fn make_event_loop(
         }
     }
 
-    let kvv_store = FsKVVStore::new(&ROOT_STORE, Some(8)).0;
+    let kvv_store = FsKVVStore::new(&ROOT_STORE, None).0;
     let fs_persister = CloudKVVStore::new(kvv_store);
 
     let _ = fs_persister.enter();