diff --git a/lib/ResourcesFS/ResourcesFS.cpp b/lib/ResourcesFS/ResourcesFS.cpp
index 393d26ea..00eeaf06 100644
--- a/lib/ResourcesFS/ResourcesFS.cpp
+++ b/lib/ResourcesFS/ResourcesFS.cpp
@@ -1,5 +1,3 @@
-#pragma once
-
 #include "ResourcesFS.h"
 
 #include <Arduino.h>
@@ -35,7 +33,6 @@ bool ResourcesFS::begin(bool remount) {
   spi_flash_mmap_handle_t map_handle;  // unused
   size_t len = impl->partition->size;
   if (len > MAX_ALLOC_SIZE) {
-    // FIXME: cannot mmap too large region at once, why?
     len = MAX_ALLOC_SIZE;
   }
 
diff --git a/lib/ResourcesFS/ResourcesFS.h b/lib/ResourcesFS/ResourcesFS.h
index e3a0bc24..6adbe582 100644
--- a/lib/ResourcesFS/ResourcesFS.h
+++ b/lib/ResourcesFS/ResourcesFS.h
@@ -11,11 +11,14 @@ class ResourcesFS {
   ResourcesFS() = default;
   ~ResourcesFS() = default;
 
+  // FIXME: true MAX_ALLOC_SIZE = ~3.5MB but not enough pages to do mmap
+  // See: spi_flash_mmap_get_free_pages() --> ~31 free pages on real device
+
   static constexpr size_t MAX_FILES = 32;
   static constexpr size_t MAX_FILE_NAME_LENGTH = 32;
-  static constexpr size_t MAX_ALLOC_SIZE = 3 * 1024 * 1024;  // 3 MB
-  static constexpr size_t ALIGNMENT = 4;                     // bytes
-  static constexpr uint32_t MAGIC = 0x46535631;              // "FSV1"
+  static constexpr size_t MAX_ALLOC_SIZE = 28 * 64 * 1024;  // 28 pages == ~1.8 MB
+  static constexpr size_t ALIGNMENT = 4;                    // bytes
+  static constexpr uint32_t MAGIC = 0x46535631;             // "FSV1"
 
   enum FileType {
     FILETYPE_INVALID = 0,