diff --git a/os/kernel/include/chfiles.h b/os/kernel/include/chfiles.h
index 4d2192eec..03313d13a 100644
--- a/os/kernel/include/chfiles.h
+++ b/os/kernel/include/chfiles.h
@@ -134,7 +134,7 @@ typedef struct {
  *
  * @api
  */
-#define chFileStreamGetSize(ip) ((ip)->vmt->getposition(ip))
+#define chFileStreamGetSize(ip) ((ip)->vmt->getsize(ip))
 
 /**
  * @brief   Returns the current file pointer position.
diff --git a/readme.txt b/readme.txt
index 9b91d0786..cd574ee30 100644
--- a/readme.txt
+++ b/readme.txt
@@ -82,6 +82,8 @@
 *****************************************************************************
 
 *** 2.5.1 ***
+- FIX: Fixed bug in abstract file interface (bug 3579660)(backported to
+  2.2.10 and 2.4.3).
 - FIX: Fixed wrong type for UART config registers (bug 3579434).
 - FIX: Fixed various typos and wrong limits in the STM32F4/F2 HAL driver
   (bug 3578944)(backported to 2.4.3).