diff --git a/src/Filters/CachedContentFilter.php b/src/Filters/CachedContentFilter.php
index 4d3b7ce..f8dce66 100644
--- a/src/Filters/CachedContentFilter.php
+++ b/src/Filters/CachedContentFilter.php
@@ -3,6 +3,8 @@
 namespace SilverStripe\VersionFeed\Filters;
 
 use SilverStripe\Core\Config\Config;
+use SilverStripe\Core\Injector\Injector;
+use SilverStripe\Core\Kernel;
 
 /**
  * Caches results of a callback
@@ -24,7 +26,7 @@ public function getContent($key, $callback)
 
         // Return cached value if available
         $cacheEnabled = Config::inst()->get(CachedContentFilter::class, 'cache_enabled');
-        $result = (isset($_GET['flush']) || !$cacheEnabled)
+        $result = (Injector::inst()->get(Kernel::class)->isFlushed() || !$cacheEnabled)
             ? null
             : $cache->get($key);
         if ($result) {
diff --git a/src/Filters/RateLimitFilter.php b/src/Filters/RateLimitFilter.php
index e8ae7e7..12b2a1b 100644
--- a/src/Filters/RateLimitFilter.php
+++ b/src/Filters/RateLimitFilter.php
@@ -6,6 +6,8 @@
 use SilverStripe\Control\Controller;
 use SilverStripe\Control\HTTPResponse_Exception;
 use SilverStripe\Versioned\Versioned;
+use SilverStripe\Core\Injector\Injector;
+use SilverStripe\Core\Kernel;
 
 /**
  * Provides rate limiting of execution of a callback
@@ -85,7 +87,7 @@ public function getContent($key, $callback)
     {
         // Bypass rate limiting if flushing, or timeout isn't set
         $timeout = $this->config()->get('lock_timeout');
-        if (isset($_GET['flush']) || !$timeout) {
+        if (Injector::inst()->get(Kernel::class)->isFlushed() || !$timeout) {
             return parent::getContent($key, $callback);
         }