diff --git a/src/test/resources/initial-content/apps/groovy/page/adaptto/html.gst b/src/test/resources/initial-content/apps/groovy/page/adaptto/html.gst
index 2c051e4..1be8198 100644
--- a/src/test/resources/initial-content/apps/groovy/page/adaptto/html.gst
+++ b/src/test/resources/initial-content/apps/groovy/page/adaptto/html.gst
@@ -20,7 +20,7 @@
 <%
     def page = request.adaptTo(org.apache.sling.scripting.groovy.it.app.Page)
 %>
-<html>
+<html lang="en">
 <head>
   <meta charset="UTF-8"/>
   <title>$page.title</title>
diff --git a/src/test/resources/initial-content/apps/groovy/page/simple/html.gst b/src/test/resources/initial-content/apps/groovy/page/simple/html.gst
index e0a612e..94d266c 100644
--- a/src/test/resources/initial-content/apps/groovy/page/simple/html.gst
+++ b/src/test/resources/initial-content/apps/groovy/page/simple/html.gst
@@ -17,7 +17,7 @@
     specific language governing permissions and limitations
     under the License.
 -->
-<html>
+<html lang="en">
 <head>
   <meta charset="UTF-8"/>
   <title>$resource.valueMap.title</title>