diff --git a/src/EventSubscriber/CacheControlOverrideSubscriber.php b/src/EventSubscriber/CacheControlOverrideSubscriber.php
index db40367..ffbdf0b 100644
--- a/src/EventSubscriber/CacheControlOverrideSubscriber.php
+++ b/src/EventSubscriber/CacheControlOverrideSubscriber.php
@@ -2,9 +2,11 @@
 
 namespace Drupal\cache_control_override\EventSubscriber;
 
+use DateTime;
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Cache\CacheableResponseInterface;
 use Drupal\Core\Config\ConfigFactoryInterface;
+use Exception;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
@@ -76,6 +78,13 @@ class CacheControlOverrideSubscriber implements EventSubscriberInterface {
         }
       }
       $response->headers->set('Cache-Control', 'public, max-age=' . $max_age);
+
+      try {
+        // This is needed because page_cache uses this header to invalidate the page cache.
+        $response->setExpires(new DateTime('+' . $max_age . ' seconds'));
+      } catch (Exception $e) {
+        // Could not set Expires header because max-age is invalid.
+      }
     }
   }