diff --git a/src/views/system.html b/src/views/system.html
index 15f3a9209..de91430fd 100644
--- a/src/views/system.html
+++ b/src/views/system.html
@@ -71,7 +71,7 @@
             <div class="col-md-12">
               <h3>
                 <span ng-bind-html="'system.diskUsage.mountedAt' | tr:{ filesystem: disk.filesystem, mountpoint: disk.mountpoint }"></span>
-                <span class="pull-right small" ng-show="disk.available && disk.size" ng-bind-html="'system.diskUsage.usedInfo' | tr:{ used: ((disk.size - disk.available) | prettyDiskSize), size: (disk.size | prettyDiskSize) }"></span>
+                <span class="pull-right small" ng-show="disk.available && disk.size" ng-bind-html="'system.diskUsage.usedInfo' | tr:{ used: (disk.used | prettyDiskSize), size: (disk.size | prettyDiskSize) }"></span>
                 <span class="pull-right small" ng-hide="disk.available && disk.size">{{ 'system.diskUsage.notAvailableYet' | tr }}</span>
               </h3>
               <div class="progress">