diff --git a/html/includes/graphs/device/humidity.inc.php b/html/includes/graphs/device/humidity.inc.php
index b7d0f1e17..58cd7b5bb 100644
--- a/html/includes/graphs/device/humidity.inc.php
+++ b/html/includes/graphs/device/humidity.inc.php
@@ -1,7 +1,7 @@
 <?php
 
 $class     = "humidity";
-$unit      = "%";
+$unit      = "%%";
 $unit_long = "Percent";
 
 include("includes/graphs/device/sensor.inc.php");