diff --git a/ghost/core/core/server/data/importer/importers/data/posts.js b/ghost/core/core/server/data/importer/importers/data/posts.js
index 76f4a30b53..b6cc4c2c19 100644
--- a/ghost/core/core/server/data/importer/importers/data/posts.js
+++ b/ghost/core/core/server/data/importer/importers/data/posts.js
@@ -272,7 +272,11 @@ class PostsImporter extends BaseImporter {
 
                 model.mobiledoc = JSON.stringify(mobiledoc);
                 model.html = mobiledocLib.mobiledocHtmlRenderer.render(JSON.parse(model.mobiledoc));
+            } else if (model.html) {
+                model.mobiledoc = JSON.stringify(mobiledocLib.htmlToMobiledocConverter(model.html));
+                model.html = mobiledocLib.mobiledocHtmlRenderer.render(JSON.parse(model.mobiledoc));
             }
+
             this.sanitizePostsMeta(model);
         });
 
diff --git a/ghost/core/test/integration/importer/v1.test.js b/ghost/core/test/integration/importer/v1.test.js
index c71109a69a..b10fa5a1ea 100644
--- a/ghost/core/test/integration/importer/v1.test.js
+++ b/ghost/core/test/integration/importer/v1.test.js
@@ -74,7 +74,7 @@ describe('Importer 1.0', function () {
                 });
         });
 
-        it('mobiledoc is null, html field is set', function () {
+        it('mobiledoc is null, html field is set, convert html -> mobiledoc', function () {
             const exportData = exportedBodyV1().db[0];
 
             exportData.data.posts[0] = testUtils.DataGenerator.forKnex.createPost({
@@ -95,8 +95,8 @@ describe('Importer 1.0', function () {
                     const posts = result[0].data.map(model => model.toJSON(options));
 
                     posts.length.should.eql(1);
-                    should(posts[0].html).eql(null);
-                    posts[0].mobiledoc.should.eql('{"version":"0.3.1","ghostVersion":"4.0","markups":[],"atoms":[],"cards":[],"sections":[[1,"p",[[0,[],0,""]]]]}');
+                    should(posts[0].html).eql('<h1 id="this-is-my-post-content">This is my post content.</h1>');
+                    posts[0].mobiledoc.should.eql('{"version":"0.3.1","atoms":[],"cards":[],"markups":[],"sections":[[1,"h1",[[0,[],0,"This is my post content."]]]]}');
                 });
         });