diff --git a/html/includes/graphs/device/ubnt_unifi_RadioCu_0.inc.php b/html/includes/graphs/device/ubnt_unifi_RadioCu_0.inc.php
index 9632cde8c7..3d0e24674e 100644
--- a/html/includes/graphs/device/ubnt_unifi_RadioCu_0.inc.php
+++ b/html/includes/graphs/device/ubnt_unifi_RadioCu_0.inc.php
@@ -10,7 +10,7 @@ $rigid = true;
 $print_total = true;
 $simple_rrd = true;
 
-if (is_file($rrd_filename)) {
+if (rrdtool_check_rrd_exists($rrd_filename)) {
     $rrd_list = array(
         array(
             'ds' => 'Radio0OtherBss',
diff --git a/html/includes/graphs/device/ubnt_unifi_RadioCu_1.inc.php b/html/includes/graphs/device/ubnt_unifi_RadioCu_1.inc.php
index 81fa57ed8c..58532bc12f 100644
--- a/html/includes/graphs/device/ubnt_unifi_RadioCu_1.inc.php
+++ b/html/includes/graphs/device/ubnt_unifi_RadioCu_1.inc.php
@@ -10,7 +10,7 @@ $rigid = true;
 $print_total = true;
 $simple_rrd = true;
 
-if (is_file($rrd_filename)) {
+if (rrdtool_check_rrd_exists($rrd_filename)) {
     $rrd_list = array(
         array(
             'ds' => 'Radio1OtherBss',