diff --git a/assets/js/src/newsletter_editor/blocks/posts.js b/assets/js/src/newsletter_editor/blocks/posts.js
index 108b83c095..5a6d7587df 100644
--- a/assets/js/src/newsletter_editor/blocks/posts.js
+++ b/assets/js/src/newsletter_editor/blocks/posts.js
@@ -107,6 +107,7 @@ define([
       _.extend(this, Radio.Requests);
 
       this.fetchAvailablePosts();
+      this.on('change', this._updateDefaults, this);
       this.on('change:amount change:contentType change:terms change:inclusionType change:postStatus change:search change:sortBy', refreshAvailablePosts);
       this.on('loadMorePosts', this._loadMorePosts, this);
 
diff --git a/tests/javascript/newsletter_editor/blocks/posts.spec.js b/tests/javascript/newsletter_editor/blocks/posts.spec.js
index d59ec048ba..cf47dd20e4 100644
--- a/tests/javascript/newsletter_editor/blocks/posts.spec.js
+++ b/tests/javascript/newsletter_editor/blocks/posts.spec.js
@@ -23,6 +23,7 @@ define([
     };
     describe('model', function () {
       var model;
+      var sandbox;
 
       before(function () {
         CommunicationComponent.getPosts = function () {
@@ -37,10 +38,12 @@ define([
         EditorApplication.getBlockTypeModel = sinon.stub().returns(Backbone.SuperModel);
         EditorApplication.getBlockTypeView = sinon.stub().returns(Backbone.View);
         model = new (PostsBlock.PostsBlockModel)();
+        sandbox = sinon.sandbox.create();
       });
 
       afterEach(function () {
         delete EditorApplication.getChannel;
+        sandbox.restore();
       });
 
       it('has posts type', function () {
@@ -259,6 +262,14 @@ define([
         expect(spy.withArgs('morePostsLoaded').calledOnce).to.be.true;// eslint-disable-line no-unused-expressions
         expect(model.get('_availablePosts').length).to.equal(3);
       });
+
+      it('updates blockDefaults.posts when changed', function () {
+        var stub = sandbox.stub(EditorApplication.getConfig(), 'set');
+        model.trigger('change');
+        expect(stub.callCount).to.equal(1);
+        expect(stub.getCall(0).args[0]).to.equal('blockDefaults.posts');
+        expect(stub.getCall(0).args[1]).to.deep.equal(model.toJSON());
+      });
     });
 
     describe('block view', function () {