diff --git a/target/linux/rockchip/armv8/base-files/etc/board.d/02_network b/target/linux/rockchip/armv8/base-files/etc/board.d/02_network
index aa91bd9a6..5d802f511 100755
--- a/target/linux/rockchip/armv8/base-files/etc/board.d/02_network
+++ b/target/linux/rockchip/armv8/base-files/etc/board.d/02_network
@@ -26,7 +26,7 @@ rockchip_setup_interfaces()
 
 nanopi_r2s_generate_mac()
 {
-	local sd_hash=$(sha256sum /sys/class/block/mmcblk0/device/cid)
+	local sd_hash=$(sha256sum /sys/class/block/mmcblk*/device/cid | head -n 1)
 	local mac_base=$(macaddr_canonicalize "$(echo "${sd_hash}" | dd bs=1 count=12 2>/dev/null)")
 	echo "$(macaddr_unsetbit_mc "$(macaddr_setbit_la "${mac_base}")")"
 }