diff --git a/serializer.js b/serializer.js
index b6edb0e..203bdae 100644
--- a/serializer.js
+++ b/serializer.js
@@ -80,6 +80,7 @@ class Serializer {
 		this.parent;
 		this._fields = new Map();
 		this.min = Number(element.getAttribute("min") || -1);
+		this.flatten = element.hasAttribute("flatten")
 
 		this.required = element.getAttribute("required") !== null || this.min != -1;
 
@@ -174,7 +175,7 @@ class Serializer {
 						}
 
 						if(k == "") {
-							if(f[key].flatten){
+							if(f[key].flatten || this.flatten){
 								json[key].push(d);
 							} else {
 								json[key] = d;
@@ -183,7 +184,7 @@ class Serializer {
 							continue
 						}
 
-						if(f[key].flatten){
+						if(f[key].flatten || this.flatten){
 							json[k].push(d);
 							continue;
 						}