diff --git a/app/provision/index.php b/app/provision/index.php
index 39310c2bbe..d837b0211e 100644
--- a/app/provision/index.php
+++ b/app/provision/index.php
@@ -109,10 +109,6 @@ require_once "resources/require.php";
 
 //check the cidr range
 	if (is_array($_SESSION['provision']["cidr"])) {
-		function check_cidr ($cidr,$ip_address) {
-			list ($subnet, $mask) = explode ('/', $cidr);
-			return ( ip2long ($ip_address) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($subnet);
-		}
 		$found = false;
 		foreach($_SESSION['provision']["cidr"] as $cidr) {
 			if (check_cidr($cidr, $_SERVER['REMOTE_ADDR'])) {
diff --git a/resources/functions.php b/resources/functions.php
index 0c43a10d16..b6f6c2950c 100644
--- a/resources/functions.php
+++ b/resources/functions.php
@@ -73,6 +73,13 @@
 		}
 	}
 
+	if (!function_exists('check_cidr')) {
+		function check_cidr ($cidr,$ip_address) {
+			list ($subnet, $mask) = explode ('/', $cidr);
+			return ( ip2long ($ip_address) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($subnet);
+		}
+	}
+
 	if (!function_exists('fix_postback')) {
 		function fix_postback($post_array) {
 			foreach ($post_array as $index => $value) {