diff --git a/src/components/Widgets/GlDiskSpace.vue b/src/components/Widgets/GlDiskSpace.vue
index c724f840..dcd01fd1 100644
--- a/src/components/Widgets/GlDiskSpace.vue
+++ b/src/components/Widgets/GlDiskSpace.vue
@@ -8,7 +8,7 @@
       ]" />
     <p class="info">
       <b>{{ $t('widgets.glances.disk-space-free') }}</b>:
-      {{ disk.used | formatSize }} out of {{ disk.size | formatSize }}
+      {{ disk.size - disk.used | formatSize }} out of {{ disk.size | formatSize }}
     </p>
     <p class="info"><b>{{ $t('widgets.glances.disk-mount-point') }}</b>: {{ disk.mnt_point }}</p>
     <p class="info"><b>{{ $t('widgets.glances.disk-file-system') }}</b>: {{ disk.fs_type }}</p>