diff --git a/openwrt/package/base-files/default/etc/functions.sh b/openwrt/package/base-files/default/etc/functions.sh
index ce22ed151c..2ce172eb35 100755
--- a/openwrt/package/base-files/default/etc/functions.sh
+++ b/openwrt/package/base-files/default/etc/functions.sh
@@ -25,7 +25,7 @@ append() {
 	local var="$1"
 	local value="$2"
 	local sep="${3:- }"
-	eval "export ${var}=\"\${${var}:+\${${var}}${value:+$sep}}$value\""
+	eval "export ${var}=\"\${${var}:+\${${var}}${value:+$sep}}\$value\""
 }
 
 reset_cb() {