diff --git a/boards/same54-xpro/include/periph_conf.h b/boards/same54-xpro/include/periph_conf.h
index e4195e97f0..b8506880d1 100644
--- a/boards/same54-xpro/include/periph_conf.h
+++ b/boards/same54-xpro/include/periph_conf.h
@@ -86,7 +86,7 @@ static const uart_conf_t uart_config[] = {
         .rx_pad   = UART_PAD_RX_1,
         .tx_pad   = UART_PAD_TX_0,
         .flags    = UART_FLAG_NONE,
-        .gclk_src = SAM0_GCLK_MAIN,
+        .gclk_src = SAM0_GCLK_48MHZ,
     }
 };
 
@@ -112,7 +112,7 @@ static const spi_conf_t spi_config[] = {
         .clk_mux  = GPIO_MUX_C,
         .miso_pad = SPI_PAD_MISO_3,
         .mosi_pad = SPI_PAD_MOSI_0_SCK_1,
-        .gclk_src = SAM0_GCLK_MAIN,
+        .gclk_src = SAM0_GCLK_48MHZ,
 
     }
 };