diff --git a/backend/pcloud/pcloud.go b/backend/pcloud/pcloud.go
index 82f9f42f5..cb470599c 100644
--- a/backend/pcloud/pcloud.go
+++ b/backend/pcloud/pcloud.go
@@ -908,10 +908,14 @@ func (f *Fs) About(ctx context.Context) (usage *fs.Usage, err error) {
 	if err != nil {
 		return nil, err
 	}
+	free := q.Quota - q.UsedQuota
+	if free < 0 {
+		free = 0
+	}
 	usage = &fs.Usage{
-		Total: fs.NewUsageValue(q.Quota),               // quota of bytes that can be used
-		Used:  fs.NewUsageValue(q.UsedQuota),           // bytes in use
-		Free:  fs.NewUsageValue(q.Quota - q.UsedQuota), // bytes which can be uploaded before reaching the quota
+		Total: fs.NewUsageValue(q.Quota),     // quota of bytes that can be used
+		Used:  fs.NewUsageValue(q.UsedQuota), // bytes in use
+		Free:  fs.NewUsageValue(free),        // bytes which can be uploaded before reaching the quota
 	}
 	return usage, nil
 }