diff --git a/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom b/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
index 30a7759ef2..f2cb1f774f 100644
--- a/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
+++ b/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
@@ -4,6 +4,17 @@
 
 . /lib/functions/caldata.sh
 
+caldata_mikrotik_ath9k() {
+	local offset=$(($1))
+	local count=$(($2))
+	local macaddr=$3
+
+	caldata_from_file $wlan_data $offset $count /tmp/$FIRMWARE
+	ath9k_patch_mac "$macaddr" /tmp/$FIRMWARE
+	caldata_sysfsload_from_file /tmp/$FIRMWARE 0x0 $count
+	rm -f /tmp/$FIRMWARE
+}
+
 wlan_data="/sys/firmware/mikrotik/hard_config/wlan_data"
 mac_base="$(cat /sys/firmware/mikrotik/hard_config/mac_base)"
 
@@ -14,16 +25,10 @@ case "$FIRMWARE" in
 	case $board in
 	mikrotik,routerboard-lhg-2nd|\
 	mikrotik,routerboard-sxt-5nd-r2)
-		caldata_from_file $wlan_data 0x1000 0x440 /tmp/$FIRMWARE
-		ath9k_patch_mac $(macaddr_add "$mac_base" +1) /tmp/$FIRMWARE
-		caldata_sysfsload_from_file /tmp/$FIRMWARE 0x0 0x440
-		rm -f /tmp/$FIRMWARE
+		caldata_mikrotik_ath9k 0x1000 0x440 $(macaddr_add "$mac_base" +1)
 		;;
 	mikrotik,routerboard-wap-g-5hact2hnd)
-		caldata_from_file $wlan_data 0x1000 0x440 /tmp/$FIRMWARE
-		ath9k_patch_mac $(macaddr_add "$mac_base" +2) /tmp/$FIRMWARE
-		caldata_sysfsload_from_file /tmp/$FIRMWARE 0x0 0x440
-		rm -f /tmp/$FIRMWARE
+		caldata_mikrotik_ath9k 0x1000 0x440 $(macaddr_add "$mac_base" +2)
 		;;
 	*)
 		caldata_die "board $board is not supported yet"