diff --git a/src/main/java/org/ligi/passandroid/ui/FullscreenBarcodeActivity.java b/src/main/java/org/ligi/passandroid/ui/FullscreenBarcodeActivity.java
index d0181d40..d0f7abd9 100644
--- a/src/main/java/org/ligi/passandroid/ui/FullscreenBarcodeActivity.java
+++ b/src/main/java/org/ligi/passandroid/ui/FullscreenBarcodeActivity.java
@@ -4,6 +4,7 @@ import android.content.pm.ActivityInfo;
 import android.content.res.Configuration;
 import android.os.Bundle;
 import android.view.Menu;
+import android.view.WindowManager;
 import android.widget.ImageView;
 
 import com.google.zxing.BarcodeFormat;
@@ -72,4 +73,9 @@ public class FullscreenBarcodeActivity extends TicketViewActivityBase {
         }
     }
 
+    @Override
+    public void onAttachedToWindow() {
+        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
+    }
+
 }
diff --git a/src/main/java/org/ligi/passandroid/ui/TicketViewActivity.java b/src/main/java/org/ligi/passandroid/ui/TicketViewActivity.java
index c95e67a2..a639d42e 100644
--- a/src/main/java/org/ligi/passandroid/ui/TicketViewActivity.java
+++ b/src/main/java/org/ligi/passandroid/ui/TicketViewActivity.java
@@ -11,6 +11,7 @@ import android.text.util.Linkify;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
+import android.view.WindowManager;
 import android.widget.ImageView;
 import android.widget.TextView;
 
@@ -156,4 +157,11 @@ public class TicketViewActivity extends TicketViewActivityBase {
 
         return super.onOptionsItemSelected(item);
     }
+
+
+    @Override
+    public void onAttachedToWindow() {
+        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
+    }
+
 }