diff --git a/os/hal/platforms/STM32/OTGv1/stm32_otg.h b/os/hal/platforms/STM32/OTGv1/stm32_otg.h
index a78ba57e4..f81ce5412 100644
--- a/os/hal/platforms/STM32/OTGv1/stm32_otg.h
+++ b/os/hal/platforms/STM32/OTGv1/stm32_otg.h
@@ -40,7 +40,7 @@
 /**
  * @brief   OTG_FS FIFO memory size in words.
  */
-#define STM32_OTG1_FIFO_MEM_SIZE        384
+#define STM32_OTG1_FIFO_MEM_SIZE        320
 
 /**
  * @brief   OTG_HS FIFO memory size in words.
diff --git a/readme.txt b/readme.txt
index ed183f690..49b5f4f1c 100644
--- a/readme.txt
+++ b/readme.txt
@@ -89,6 +89,8 @@
 *****************************************************************************
 
 *** 2.7.0 ***
+- FIX: Fixed STM32 OTG-FS wrong upper memory limit (bug #437)(backported
+  to 2.6.2).
 - FIX: Fixed timing issue in the STM32 OTGv1 USB driver (bug #436)(backported
   to 2.6.2).
 - FIX: Fixed STM32L1 remove reset flag (bug #435)(backported to 2.6.2).