diff --git a/os/various/fatfs_bindings/fatfs_syscall.c b/os/various/fatfs_bindings/fatfs_syscall.c
index 09ebb1dd9..d048ca278 100644
--- a/os/various/fatfs_bindings/fatfs_syscall.c
+++ b/os/various/fatfs_bindings/fatfs_syscall.c
@@ -26,19 +26,18 @@
 #include "ch.h"
 #include "ff.h"
 
-MEMORYPOOL_DECL(fs_sem_pool, sizeof(Semaphore), chCoreAllocI);
-
 #if _FS_REENTRANT
+/*------------------------------------------------------------------------*/
+/* Static array of Synchronization Objects                                */
+/*------------------------------------------------------------------------*/
+static Semaphore ff_sem[_VOLUMES];
+
 /*------------------------------------------------------------------------*/
 /* Create a Synchronization Object                                        */
 /*------------------------------------------------------------------------*/
 int ff_cre_syncobj(BYTE vol, _SYNC_t *sobj) {
 
-  (void)vol;
-
-  *sobj = chPoolAlloc(&fs_sem_pool);
-  if (*sobj == NULL)
-    return FALSE;
+  *sobj = &ff_sem[vol];
   chSemInit(*sobj, 1);
   return TRUE;
 }
@@ -49,7 +48,6 @@ int ff_cre_syncobj(BYTE vol, _SYNC_t *sobj) {
 int ff_del_syncobj(_SYNC_t sobj) {
 
   chSemReset(sobj, 0);
-  chPoolFree(&fs_sem_pool, sobj);
   return TRUE;
 }
 
diff --git a/readme.txt b/readme.txt
index 482ddc028..51ebeb21b 100644
--- a/readme.txt
+++ b/readme.txt
@@ -83,6 +83,8 @@
 *****************************************************************************
 
 *** 2.5.1 ***
+- FIX: Fixed FatFS won't compile with _FS_REENTRANT enabled (bug 3570135)
+  (backported to 2.4.3).
 - FIX: Fixed mmc_spi.c won't compile due to misplaced declaration (bug
   3570035)(backported to 2.4.3).
 - FIX: Fixed problem in STM32F1xx USB driver after revision 4598 (bug 3569374).