diff --git a/backend/webdav/webdav.go b/backend/webdav/webdav.go
index 96b8a053b..de1e9f3b3 100644
--- a/backend/webdav/webdav.go
+++ b/backend/webdav/webdav.go
@@ -916,11 +916,13 @@ func (f *Fs) About() (*fs.Usage, error) {
 		return nil, errors.Wrap(err, "about call failed")
 	}
 	usage := &fs.Usage{}
-	if q.Available >= 0 && q.Used >= 0 {
-		usage.Total = fs.NewUsageValue(q.Available + q.Used)
-	}
-	if q.Used >= 0 {
-		usage.Used = fs.NewUsageValue(q.Used)
+	if q.Available != 0 || q.Used != 0 {
+		if q.Available >= 0 && q.Used >= 0 {
+			usage.Total = fs.NewUsageValue(q.Available + q.Used)
+		}
+		if q.Used >= 0 {
+			usage.Used = fs.NewUsageValue(q.Used)
+		}
 	}
 	return usage, nil
 }