diff --git a/src/Filters/CachedContentFilter.php b/src/Filters/CachedContentFilter.php
index 00fc8da..4d3b7ce 100644
--- a/src/Filters/CachedContentFilter.php
+++ b/src/Filters/CachedContentFilter.php
@@ -23,7 +23,7 @@ class CachedContentFilter extends ContentFilter
         $cache = $this->getCache();
 
         // Return cached value if available
-        $cacheEnabled = Config::inst()->get(self::class, 'cache_enabled');
+        $cacheEnabled = Config::inst()->get(CachedContentFilter::class, 'cache_enabled');
         $result = (isset($_GET['flush']) || !$cacheEnabled)
             ? null
             : $cache->get($key);
diff --git a/src/Filters/RateLimitFilter.php b/src/Filters/RateLimitFilter.php
index 02b3f56..e8ae7e7 100644
--- a/src/Filters/RateLimitFilter.php
+++ b/src/Filters/RateLimitFilter.php
@@ -64,7 +64,7 @@ class RateLimitFilter extends ContentFilter
      */
     protected function getCacheKey($itemkey)
     {
-        $key = self::CACHE_PREFIX;
+        $key = RateLimitFilter::CACHE_PREFIX;
 
         // Add global identifier
         if ($this->config()->get('lock_bypage')) {
diff --git a/src/VersionFeed.php b/src/VersionFeed.php
index 312129a..acd2e89 100644
--- a/src/VersionFeed.php
+++ b/src/VersionFeed.php
@@ -206,7 +206,7 @@ class VersionFeed extends SiteTreeExtension
 
     public function getSiteRSSLink()
     {
-        if (Config::inst()->get(self::class, 'allchanges_enabled')
+        if (Config::inst()->get(VersionFeed::class, 'allchanges_enabled')
             && SiteConfig::current_site_config()->AllChangesEnabled
         ) {
             return $this->owner->Link('allchanges');
@@ -215,7 +215,7 @@ class VersionFeed extends SiteTreeExtension
 
     public function getDefaultRSSLink()
     {
-        if (Config::inst()->get(self::class, 'changes_enabled') && $this->owner->PublicHistory) {
+        if (Config::inst()->get(VersionFeed::class, 'changes_enabled') && $this->owner->PublicHistory) {
             return $this->owner->Link('changes');
         }
     }