diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/CodeMirrorDemo.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/CodeMirrorDemo.java
index d11e8e1..904b535 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/CodeMirrorDemo.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/CodeMirrorDemo.java
@@ -60,6 +60,7 @@
   @Override
   protected void onInitUI() {
     super.onInitUI();
+    setHeaderVisible(false);
     add(diffTable = new DiffTable());
   }