diff --git a/boards/arm/mps/mps2-an521/configs/nsh/defconfig b/boards/arm/mps/mps2-an521/configs/nsh/defconfig
index 462c9ed8e1444..2b6006cfc165f 100644
--- a/boards/arm/mps/mps2-an521/configs/nsh/defconfig
+++ b/boards/arm/mps/mps2-an521/configs/nsh/defconfig
@@ -23,9 +23,9 @@ CONFIG_CMSDK_UART0=y
 CONFIG_CMSDK_UART0_BASE=0x50200000
 CONFIG_CMSDK_UART0_CLOCK=25000000
 CONFIG_CMSDK_UART0_OV_IRQ=63
-CONFIG_CMSDK_UART0_RX_IRQ=49
+CONFIG_CMSDK_UART0_RX_IRQ=48
 CONFIG_CMSDK_UART0_SERIAL_CONSOLE=y
-CONFIG_CMSDK_UART0_TX_IRQ=48
+CONFIG_CMSDK_UART0_TX_IRQ=49
 CONFIG_CMSDK_UART=y
 CONFIG_DEBUG_ASSERTIONS=y
 CONFIG_DEBUG_FEATURES=y