diff --git a/package/base-files/files/lib/functions/uci-defaults.sh b/package/base-files/files/lib/functions/uci-defaults.sh
index eb5b240ee3..5a8809d68c 100644
--- a/package/base-files/files/lib/functions/uci-defaults.sh
+++ b/package/base-files/files/lib/functions/uci-defaults.sh
@@ -140,6 +140,23 @@ EOF
 	UCIDEF_LEDS_CHANGED=1
 }
 
+ucidef_set_led_mmc() {
+	local cfg="led_$1"
+	local name=$2
+	local sysfs=$3
+	local trigger=$4
+
+	uci -q get system.$cfg && return 0
+
+	uci batch <<EOF
+set system.$cfg='led'
+set system.$cfg.name='$name'
+set system.$cfg.sysfs='$sysfs'
+set system.$cfg.trigger='$trigger'
+EOF
+	UCIDEF_LEDS_CHANGED=1
+}
+
 ucidef_set_rssimon() {
 	local dev="$1"
 	local refresh="$2"