diff --git a/esp8266/main.c b/esp8266/main.c
index a2e747d..5087c7d 100644
--- a/esp8266/main.c
+++ b/esp8266/main.c
@@ -109,17 +109,13 @@
     system_init_done_cb(init_done);
 }
 
-mp_lexer_t *fat_vfs_lexer_new_from_file(const char *filename);
 mp_import_stat_t fat_vfs_import_stat(const char *path);
 
+#if !MICROPY_VFS_FAT
 mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
-    #if MICROPY_VFS_FAT
-    return fat_vfs_lexer_new_from_file(filename);
-    #else
-    (void)filename;
     return NULL;
-    #endif
 }
+#endif
 
 mp_import_stat_t mp_import_stat(const char *path) {
     #if MICROPY_VFS_FAT
diff --git a/esp8266/mpconfigport.h b/esp8266/mpconfigport.h
index adbec5d..cc0b229 100644
--- a/esp8266/mpconfigport.h
+++ b/esp8266/mpconfigport.h
@@ -16,7 +16,7 @@
 #define MICROPY_MEM_STATS           (0)
 #define MICROPY_DEBUG_PRINTERS      (1)
 #define MICROPY_DEBUG_PRINTER_DEST  mp_debug_print
-#define MICROPY_READER_FATFS        (1)
+#define MICROPY_READER_FATFS        (MICROPY_VFS_FAT)
 #define MICROPY_ENABLE_GC           (1)
 #define MICROPY_STACK_CHECK         (1)
 #define MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF (1)