diff --git a/package/base-files/files/lib/functions.sh b/package/base-files/files/lib/functions.sh
index 1b34b8f50dcb12782e0f63105e814f1b72d50503..e55cad0b200275cdbbe4d08bad13fad24d45c6a4 100755
--- a/package/base-files/files/lib/functions.sh
+++ b/package/base-files/files/lib/functions.sh
@@ -168,6 +168,13 @@ include() {
 	done
 }
 
+find_mtd_index() {
+	local PART="$(grep "\"$1\"" /proc/mtd | awk -F: '{print $1}')"
+	local INDEX="${PART##mtd}"
+
+	echo ${INDEX}
+}
+
 find_mtd_part() {
 	local INDEX=$(find_mtd_index "$1")
 	local PREFIX=/dev/mtdblock
diff --git a/package/base-files/files/lib/functions/system.sh b/package/base-files/files/lib/functions/system.sh
index 76554601595c7cd3a251fe4c387857d68500e800..a4c0f2620c5e9179b5033a4c5a4ecf8d34d31a5c 100644
--- a/package/base-files/files/lib/functions/system.sh
+++ b/package/base-files/files/lib/functions/system.sh
@@ -1,12 +1,5 @@
 # Copyright (C) 2006-2013 OpenWrt.org
 
-find_mtd_index() {
-	local PART="$(grep "\"$1\"" /proc/mtd | awk -F: '{print $1}')"
-	local INDEX="${PART##mtd}"
-
-	echo ${INDEX}
-}
-
 find_mtd_chardev() {
 	local INDEX=$(find_mtd_index "$1")
 	local PREFIX=/dev/mtd