diff --git a/src/serde.ts b/src/serde.ts
index 914041a..30e1f0f 100644
--- a/src/serde.ts
+++ b/src/serde.ts
@@ -31,7 +31,7 @@ export abstract class Serde<S> extends Object {
 
   serialize() {
     const pluckProperties = Reflect.getMetadata(PLUCK_PROPERTIES_KEY, this) as {[key: string]: any};
-    return Object.entries(this)
+    let serializedObj = Object.entries(this)
       .filter(([key, _]) => this.removeableProperty(key))
       .reduce((obj, [key, value]) => {
         if (!!pluckProperties) {
@@ -50,11 +50,12 @@ export abstract class Serde<S> extends Object {
           }
         }
         obj[key] = this.recursiveSerialize(value);
-        if (typeof this.customSerialize === 'function') {
-          obj = this.customSerialize(obj);
-        }
         return obj;
       }, {} as Partial<S>);
+      if (typeof this.customSerialize === 'function') {
+        serializedObj = this.customSerialize(serializedObj);
+      }
+      return serializedObj;
   }
 
 }
\ No newline at end of file
diff --git a/tests/decorators/custom-serializer.spec.ts b/tests/decorators/custom-serializer.spec.ts
new file mode 100644
index 0000000..6fdcb2f
--- /dev/null
+++ b/tests/decorators/custom-serializer.spec.ts
@@ -0,0 +1,30 @@
+import 'reflect-metadata';
+import { Serde } from "src/serde";
+import { Exclude } from 'src/decorators';
+
+class NestedModel extends Serde<NestedModel> {
+    name: string;
+    @Exclude() excluded: boolean;
+}
+
+class ParentModel extends Serde<ParentModel> {
+    name: string;
+    nested: NestedModel;
+    @Exclude() excluded: boolean;
+}
+
+describe('Custom serlializer', () => {
+    it('should run custom seiralizer once', () => {
+        const testModel = new ParentModel().deserialize({
+            name: 'parent model',
+            excluded: true,
+            nested: new NestedModel().deserialize({
+                name: 'nested model',
+                excluded: true
+            })
+        });
+        
+        const serializedModel = testModel.serialize();
+        expect(serializedModel).toEqual({ name: 'parent model', nested: { name: 'nested model' } });
+    });
+});
\ No newline at end of file