diff --git a/drivers/slipdev/include/slipdev_params.h b/drivers/slipdev/include/slipdev_params.h
index d9e44cc2f6..c1b8ab155d 100644
--- a/drivers/slipdev/include/slipdev_params.h
+++ b/drivers/slipdev/include/slipdev_params.h
@@ -34,9 +34,13 @@ extern "C" {
  */
 #ifndef SLIPDEV_PARAM_UART
 # ifndef MODULE_SLIPDEV_STDIO
-#  define SLIPDEV_PARAM_UART        (UART_DEV(0))
+#  ifdef MODULE_USBUS_CDC_ACM
+#   define SLIPDEV_PARAM_UART       UART_DEV(0)
+#  else
+#   define SLIPDEV_PARAM_UART       UART_DEV(1)
+#  endif
 # else  /* MODULE_SLIPDEV_STDIO */
-#  define SLIPDEV_PARAM_UART        (STDIO_UART_DEV)
+#  define SLIPDEV_PARAM_UART        STDIO_UART_DEV
 # endif /* MODULE_SLIPDEV_STDIO */
 #endif  /* SLIPDEV_PARAM_UART */
 #ifndef SLIPDEV_PARAM_BAUDRATE