diff --git a/http/resource.go b/http/resource.go
index 422e8389..3a12538a 100644
--- a/http/resource.go
+++ b/http/resource.go
@@ -351,19 +351,19 @@ var diskUsage = withUser(func(w http.ResponseWriter, r *http.Request, d *data) (
 		return errToStatus(err), err
 	}
 	fPath := file.RealPath()
-	if file.IsDir {
-		usage, err := disk.UsageWithContext(r.Context(), fPath)
-		if err != nil {
-			return errToStatus(err), err
-		}
-		return renderJSON(w, r, &DiskUsageResponse{
-			Total: usage.Total,
-			Used:  usage.Used,
-		})
-	} else {
+	if !file.IsDir {
 		return renderJSON(w, r, &DiskUsageResponse{
 			Total: 0,
 			Used:  0,
 		})
 	}
+
+	usage, err := disk.UsageWithContext(r.Context(), fPath)
+	if err != nil {
+		return errToStatus(err), err
+	}
+	return renderJSON(w, r, &DiskUsageResponse{
+		Total: usage.Total,
+		Used:  usage.Used,
+	})
 })