diff --git a/src/mainboard/google/reef/variants/pyro/devicetree.cb b/src/mainboard/google/reef/variants/pyro/devicetree.cb
index 808ed2c..5bfe2c2 100644
--- a/src/mainboard/google/reef/variants/pyro/devicetree.cb
+++ b/src/mainboard/google/reef/variants/pyro/devicetree.cb
@@ -17,6 +17,9 @@
 	# If the Board does not have PERST_0, assign GPIO_PRT0_UDEF
 	register "prt0_gpio" = "GPIO_122"
 
+	# GPIO for SD card detect
+	register "sdcard_cd_gpio" = "GPIO_177"
+
 	# EMMC TX DATA Delay 1
 	# Refer to EDS-Vol2-22.3.
 	# [14:8] steps of delay for HS400, each 125ps.