diff --git a/os/hal/ports/STM32/OTGv1/stm32_otg.h b/os/hal/ports/STM32/OTGv1/stm32_otg.h
index a78ba57e4..f81ce5412 100644
--- a/os/hal/ports/STM32/OTGv1/stm32_otg.h
+++ b/os/hal/ports/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.