diff --git a/SerialPorts.c b/SerialPorts.c
index 13c1bc3..05afe7d 100644
--- a/SerialPorts.c
+++ b/SerialPorts.c
@@ -99,7 +99,7 @@ static void vSerialPort_InitUSART2(tSerialPortFlagchip *env) {
             sizeof(buf_USART2_DMA),
 
             DMA0_IRQn,
-            0xFF, // IRQ_DMA_PRIORITY
+            0x55, // IRQ_DMA_PRIORITY
             2, // IRQ_DMA_CHANNEL_PRIORITY
 
             1024,