diff --git a/Libraries/BSP_LL/Src/py32f0xx_bsp_printf.c b/Libraries/BSP_LL/Src/py32f0xx_bsp_printf.c
index 778ab02..7d818db 100644
--- a/Libraries/BSP_LL/Src/py32f0xx_bsp_printf.c
+++ b/Libraries/BSP_LL/Src/py32f0xx_bsp_printf.c
@@ -38,6 +38,12 @@ void BSP_USART_Config(uint32_t baudRate)
   LL_GPIO_SetPinSpeed(DEBUG_USART_RX_GPIO_PORT, DEBUG_USART_RX_PIN, LL_GPIO_SPEED_FREQ_VERY_HIGH);
   LL_GPIO_SetPinPull(DEBUG_USART_RX_GPIO_PORT, DEBUG_USART_RX_PIN, LL_GPIO_PULL_UP);
   LL_GPIO_SetAFPin_0_7(DEBUG_USART_RX_GPIO_PORT, DEBUG_USART_RX_PIN, DEBUG_USART_RX_AF);
+
+#if defined (__GNUC__) && !defined (__clang__)
+    // To avoid io buffer
+    setvbuf(stdout, NULL, _IONBF, 0);
+    setvbuf(stdin, NULL, _IONBF, 0);
+#endif
 }