diff --git a/board/czechlight/clearfog/linux.fragment b/board/czechlight/clearfog/linux.fragment
index 724d3c5..83cd006 100644
--- a/board/czechlight/clearfog/linux.fragment
+++ b/board/czechlight/clearfog/linux.fragment
@@ -17,3 +17,6 @@
 
 # Extra I2C bus for the PSUs
 CONFIG_I2C_GPIO=y
+
+# SPI GPIO expander
+CONFIG_PINCTRL_MCP23S08=y