diff --git a/boards/mulle/include/periph_conf.h b/boards/mulle/include/periph_conf.h
index f36c4fa0bb0499251d00e95a7b588e78ecec892d..19f1a23431e4f1ab0c4d11a4efd3163ff5a6f2f1 100644
--- a/boards/mulle/include/periph_conf.h
+++ b/boards/mulle/include/periph_conf.h
@@ -128,8 +128,8 @@ static const uart_conf_t uart_config[] = {
     {
         .dev    = UART0,
         .freq   = CLOCK_CORECLOCK,
-        .pin_rx = GPIO_PIN(PORT_A, 14),
-        .pin_tx = GPIO_PIN(PORT_A, 15),
+        .pin_rx = GPIO_PIN(PORT_A, 15),
+        .pin_tx = GPIO_PIN(PORT_A, 14),
         .pcr_rx = PORT_PCR_MUX(3),
         .pcr_tx = PORT_PCR_MUX(3),
         .irqn   = UART0_RX_TX_IRQn,