diff --git a/boards/arm/rp2040/raspberrypi-pico/configs/smp/defconfig b/boards/arm/rp2040/raspberrypi-pico/configs/smp/defconfig
index 40de637396..d181ccef37 100644
--- a/boards/arm/rp2040/raspberrypi-pico/configs/smp/defconfig
+++ b/boards/arm/rp2040/raspberrypi-pico/configs/smp/defconfig
@@ -52,3 +52,4 @@ CONFIG_TESTING_GETPRIME=y
 CONFIG_TESTING_OSTEST=y
 CONFIG_TESTING_SMP=y
 CONFIG_UART0_SERIAL_CONSOLE=y
+CONFIG_UART0_TXBUFSIZE=384