diff --git a/packages/Shell/src/com/android/shell/BugreportWarningActivity.java b/packages/Shell/src/com/android/shell/BugreportWarningActivity.java
index 2191d939e5914..ecd1369817b47 100644
--- a/packages/Shell/src/com/android/shell/BugreportWarningActivity.java
+++ b/packages/Shell/src/com/android/shell/BugreportWarningActivity.java
@@ -29,6 +29,7 @@ import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
 import android.view.LayoutInflater;
+import android.view.WindowManager;
 import android.widget.CheckBox;
 
 import com.android.internal.app.AlertActivity;
@@ -47,6 +48,10 @@ public class BugreportWarningActivity extends AlertActivity
     public void onCreate(Bundle icicle) {
         super.onCreate(icicle);
 
+        // Don't allow overlay windows.
+        getWindow().addSystemFlags(
+                WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
+
         mSendIntent = getIntent().getParcelableExtra(Intent.EXTRA_INTENT);
 
         // We need to touch the extras to unpack them so they get migrated to