diff --git a/editor/actions.js b/editor/actions.js
index 31387abc78b6c..3d6be1f3528b7 100644
--- a/editor/actions.js
+++ b/editor/actions.js
@@ -55,6 +55,7 @@ export function savePost( postId, edits ) {
 		type: 'REQUEST_POST_UPDATE',
 		edits,
 		postId,
+		isNew: ! postId,
 	};
 }
 
diff --git a/editor/test/actions.js b/editor/test/actions.js
index 22a78ee696420..cc3a89ab19f1f 100644
--- a/editor/test/actions.js
+++ b/editor/test/actions.js
@@ -6,7 +6,11 @@ import { expect } from 'chai';
 /**
  * Internal dependencies
  */
-import { focusBlock, replaceBlocks } from '../actions';
+import {
+	focusBlock,
+	replaceBlocks,
+	savePost,
+} from '../actions';
 
 describe( 'actions', () => {
 	describe( 'focusBlock', () => {
@@ -36,4 +40,24 @@ describe( 'actions', () => {
 			} );
 		} );
 	} );
+
+	describe( 'savePost', () => {
+		it( 'should return the REQUEST_POST_UPDATE action for a new post', () => {
+			expect( savePost( null, { title: 'changed' } ) ).to.eql( {
+				type: 'REQUEST_POST_UPDATE',
+				edits: { title: 'changed' },
+				postId: null,
+				isNew: true,
+			} );
+		} );
+
+		it( 'should return the REQUEST_POST_UPDATE action for an existing post', () => {
+			expect( savePost( 1, { title: 'changed' } ) ).to.eql( {
+				type: 'REQUEST_POST_UPDATE',
+				edits: { title: 'changed' },
+				postId: 1,
+				isNew: false,
+			} );
+		} );
+	} );
 } );