diff --git a/board/czechlight/clearfog/linux.fragment b/board/czechlight/clearfog/linux.fragment
index 2ccbf53..b2db091 100644
--- a/board/czechlight/clearfog/linux.fragment
+++ b/board/czechlight/clearfog/linux.fragment
@@ -11,3 +11,6 @@
 # PMBus for the PSUs
 CONFIG_PMBUS=y
 CONFIG_SENSORS_PMBUS=y
+
+# SPI-to-Quad-UART
+CONFIG_SERIAL_MAX310X=y