diff --git a/app/assets/javascripts/admin/controllers/admin-customize-themes-show.js b/app/assets/javascripts/admin/controllers/admin-customize-themes-show.js
index a8e25fdec98..006f1728da0 100644
--- a/app/assets/javascripts/admin/controllers/admin-customize-themes-show.js
+++ b/app/assets/javascripts/admin/controllers/admin-customize-themes-show.js
@@ -203,6 +203,17 @@ export default Controller.extend({
     );
   },
   sourceIsHttp: match("model.remote_theme.remote_url", /^http(s)?:\/\//),
+
+  @discourseComputed(
+    "model.remote_theme.remote_url",
+    "model.remote_theme.branch"
+  )
+  remoteThemeLink(remoteThemeUrl, remoteThemeBranch) {
+    return remoteThemeBranch
+      ? `${remoteThemeUrl.replace(/\.git$/, "")}/tree/${remoteThemeBranch}`
+      : remoteThemeUrl;
+  },
+
   actions: {
     updateToLatest() {
       this.set("updatingRemote", true);
diff --git a/app/assets/javascripts/admin/templates/customize-themes-show.hbs b/app/assets/javascripts/admin/templates/customize-themes-show.hbs
index b4c4e9a8f46..ed4dcf0eb18 100644
--- a/app/assets/javascripts/admin/templates/customize-themes-show.hbs
+++ b/app/assets/javascripts/admin/templates/customize-themes-show.hbs
@@ -63,7 +63,7 @@
 
     {{#if model.remote_theme.remote_url}}
       {{#if sourceIsHttp}}
-        <a class="remote-url" href={{model.remote_theme.remote_url}}>{{i18n "admin.customize.theme.source_url"}}{{d-icon "link"}}</a>
+        <a class="remote-url" href={{remoteThemeLink}}>{{i18n "admin.customize.theme.source_url"}}{{d-icon "link"}}</a>
       {{else}}
         <div class="remote-url"><code>{{model.remote_theme.remote_url}}</code></div>
       {{/if}}
diff --git a/app/serializers/theme_serializer.rb b/app/serializers/theme_serializer.rb
index 0682f694877..7d568904541 100644
--- a/app/serializers/theme_serializer.rb
+++ b/app/serializers/theme_serializer.rb
@@ -47,7 +47,7 @@ class BasicThemeSerializer < ApplicationSerializer
 end
 
 class RemoteThemeSerializer < ApplicationSerializer
-  attributes :id, :remote_url, :remote_version, :local_version, :commits_behind,
+  attributes :id, :remote_url, :remote_version, :local_version, :commits_behind, :branch,
              :remote_updated_at, :updated_at, :github_diff_link, :last_error_text, :is_git?,
              :license_url, :about_url, :authors, :theme_version, :minimum_discourse_version, :maximum_discourse_version
 
diff --git a/test/javascripts/admin/controllers/admin-customize-themes-show-test.js.es6 b/test/javascripts/admin/controllers/admin-customize-themes-show-test.js.es6
new file mode 100644
index 00000000000..10cc64279ec
--- /dev/null
+++ b/test/javascripts/admin/controllers/admin-customize-themes-show-test.js.es6
@@ -0,0 +1,49 @@
+import { mapRoutes } from "discourse/mapping-router";
+import Theme from "admin/models/theme";
+
+moduleFor("controller:admin-customize-themes-show", {
+  beforeEach() {
+    this.registry.register("router:main", mapRoutes());
+  },
+  needs: ["controller:adminUser"]
+});
+
+const repoUrl = "https://github.com/discourse/discourse-brand-header.git";
+const remoteTheme = Theme.create({
+  id: 2,
+  default: true,
+  name: "default",
+  remote_theme: {
+    remote_url: repoUrl
+  }
+});
+
+QUnit.test("can display source url for remote themes", function(assert) {
+  const controller = this.subject({
+    model: remoteTheme
+  });
+
+  assert.deepEqual(
+    controller.get("remoteThemeLink"),
+    repoUrl,
+    "returns theme's repo URL"
+  );
+});
+
+QUnit.test("can display source url for remote theme branches", function(
+  assert
+) {
+  const branchUrl =
+    "https://github.com/discourse/discourse-brand-header/tree/beta";
+  remoteTheme["remote_theme"]["branch"] = "beta";
+
+  const controller = this.subject({
+    model: remoteTheme
+  });
+
+  assert.deepEqual(
+    controller.get("remoteThemeLink"),
+    branchUrl,
+    "returns theme's repo URL to branch"
+  );
+});