diff --git a/kernel/av/av.go b/kernel/av/av.go
index 61be468ff..e48f33692 100644
--- a/kernel/av/av.go
+++ b/kernel/av/av.go
@@ -211,7 +211,7 @@ func ParseAttributeView(avID string) (ret *AttributeView, err error) {
 }
 
 func SaveAttributeView(av *AttributeView) (err error) {
-	data, err := gulu.JSON.MarshalIndentJSON(av, "", "\t")
+	data, err := gulu.JSON.MarshalIndentJSON(av, "", "\t") // TODO: single-line for production
 	if nil != err {
 		logging.LogErrorf("marshal attribute view [%s] failed: %s", av.ID, err)
 		return
diff --git a/kernel/model/file.go b/kernel/model/file.go
index 81fdf3005..8542f9190 100644
--- a/kernel/model/file.go
+++ b/kernel/model/file.go
@@ -1574,7 +1574,7 @@ func moveSorts(rootID, fromBox, toBox string) {
 		toFullSortIDs[id] = sortVal
 	}
 
-	data, err := gulu.JSON.MarshalIndentJSON(toFullSortIDs, "", "  ")
+	data, err := gulu.JSON.MarshalJSON(toFullSortIDs)
 	if nil != err {
 		logging.LogErrorf("marshal sort conf failed: %s", err)
 		return
@@ -1649,7 +1649,7 @@ func ChangeFileTreeSort(boxID string, paths []string) {
 		fullSortIDs[sortID] = sortVal
 	}
 
-	data, err = gulu.JSON.MarshalIndentJSON(fullSortIDs, "", "  ")
+	data, err = gulu.JSON.MarshalJSON(fullSortIDs)
 	if nil != err {
 		logging.LogErrorf("marshal sort conf failed: %s", err)
 		return
@@ -1708,7 +1708,7 @@ func (box *Box) removeSort(ids []string) {
 		delete(fullSortIDs, toRemove)
 	}
 
-	data, err = gulu.JSON.MarshalIndentJSON(fullSortIDs, "", "  ")
+	data, err = gulu.JSON.MarshalJSON(fullSortIDs)
 	if nil != err {
 		logging.LogErrorf("marshal sort conf failed: %s", err)
 		return