diff --git a/core/server/data/importer/importers/data/posts.js b/core/server/data/importer/importers/data/posts.js
index 3d11af836a..7aed40885b 100644
--- a/core/server/data/importer/importers/data/posts.js
+++ b/core/server/data/importer/importers/data/posts.js
@@ -216,6 +216,12 @@ class PostsImporter extends BaseImporter {
                     mobiledoc = mobiledocLib.blankDocument;
                 }
 
+                // ghostVersion was introduced in 4.0. Any earlier content won't have it set
+                // so we should set it to "3.0" to match rendering output
+                if (!mobiledoc.ghostVersion) {
+                    mobiledoc.ghostVersion = '3.0';
+                }
+
                 mobiledoc.cards.forEach((card) => {
                     // Ghost 1.0 markdown card = 'card-markdown', Ghost 2.0 markdown card = 'markdown'
                     if (card[0] === 'card-markdown') {
diff --git a/test/regression/importer/importer_spec.js b/test/regression/importer/importer_spec.js
index 1d1f7135f7..db00681251 100644
--- a/test/regression/importer/importer_spec.js
+++ b/test/regression/importer/importer_spec.js
@@ -1145,7 +1145,6 @@ describe('Integration: Importer', function () {
                 slug: 'post1',
                 mobiledoc: JSON.stringify({
                     version: '0.3.1',
-                    ghostVersion: '3.0', // 3.0 is when ghostVersion was introduced
                     markups: [],
                     atoms: [],
                     cards: [
@@ -1175,7 +1174,7 @@ describe('Integration: Importer', function () {
 
                     posts.length.should.eql(1);
 
-                    posts[0].mobiledoc.should.eql('{"version":"0.3.1","markups":[],"atoms":[],"cards":[["image",{"src":"source","cardWidth":"wide"}],["markdown",{"markdown":"# Post Content"}]],"sections":[[10,0],[10,1]]}');
+                    posts[0].mobiledoc.should.eql('{"version":"0.3.1","markups":[],"atoms":[],"cards":[["image",{"src":"source","cardWidth":"wide"}],["markdown",{"markdown":"# Post Content"}]],"sections":[[10,0],[10,1]],"ghostVersion":"3.0"}');
                     posts[0].html.should.eql('<figure class="kg-card kg-image-card kg-width-wide"><img src="source" class="kg-image" alt></figure><!--kg-card-begin: markdown--><h1 id="postcontent">Post Content</h1>\n<!--kg-card-end: markdown-->');
                 });
         });
@@ -1187,7 +1186,6 @@ describe('Integration: Importer', function () {
                 slug: 'post1',
                 mobiledoc: JSON.stringify({
                     version: '0.3.1',
-                    ghostVersion: '3.0', // 3.0 is when ghostVersion was introduced
                     markups: [],
                     atoms: [],
                     cards: [
@@ -1209,7 +1207,6 @@ describe('Integration: Importer', function () {
                 slug: 'post2',
                 mobiledoc: JSON.stringify({
                     version: '0.3.1',
-                    ghostVersion: '3.0',
                     markups: [],
                     atoms: [],
                     cards: [
@@ -1238,10 +1235,10 @@ describe('Integration: Importer', function () {
 
                     posts.length.should.eql(2);
 
-                    posts[0].mobiledoc.should.eql('{"version":"0.3.1","markups":[],"atoms":[],"cards":[["markdown",{"markdown":"## Post Content"}],["image",{"src":"source2","cardWidth":"not-wide"}]],"sections":[[10,0],[10,1]]}');
+                    posts[0].mobiledoc.should.eql('{"version":"0.3.1","markups":[],"atoms":[],"cards":[["markdown",{"markdown":"## Post Content"}],["image",{"src":"source2","cardWidth":"not-wide"}]],"sections":[[10,0],[10,1]],"ghostVersion":"3.0"}');
                     posts[0].html.should.eql('<!--kg-card-begin: markdown--><h2 id="postcontent">Post Content</h2>\n<!--kg-card-end: markdown--><figure class="kg-card kg-image-card kg-width-not-wide"><img src="source2" class="kg-image" alt></figure>');
 
-                    posts[1].mobiledoc.should.eql('{"version":"0.3.1","markups":[],"atoms":[],"cards":[["image",{"src":"source","cardWidth":"wide"}],["markdown",{"markdown":"# Post Content"}]],"sections":[[10,0],[10,1]]}');
+                    posts[1].mobiledoc.should.eql('{"version":"0.3.1","markups":[],"atoms":[],"cards":[["image",{"src":"source","cardWidth":"wide"}],["markdown",{"markdown":"# Post Content"}]],"sections":[[10,0],[10,1]],"ghostVersion":"3.0"}');
                     posts[1].html.should.eql('<figure class="kg-card kg-image-card kg-width-wide"><img src="source" class="kg-image" alt></figure><!--kg-card-begin: markdown--><h1 id="postcontent">Post Content</h1>\n<!--kg-card-end: markdown-->');
                 });
         });