diff --git a/esp8266/main.c b/esp8266/main.c
index 986be3a61cdc76f2083344246c00aaeb799a2c9e..bd1328ec76f0eac0b85f9338c0cdbb7e16fbf2d9 100644
--- a/esp8266/main.c
+++ b/esp8266/main.c
@@ -48,6 +48,7 @@ STATIC void mp_reset(void) {
     mp_init();
     mp_obj_list_init(mp_sys_path, 0);
     mp_obj_list_init(mp_sys_argv, 0);
+    memset(MP_STATE_PORT(fs_user_mount), 0, sizeof(MP_STATE_PORT(fs_user_mount)));
     MP_STATE_PORT(mp_kbd_exception) = mp_obj_new_exception(&mp_type_KeyboardInterrupt);
 #if MICROPY_MODULE_FROZEN
     pyexec_frozen_module("boot");