diff --git a/lib/mastodon/redis_config.rb b/lib/mastodon/redis_config.rb
index 3f2a8f7c2..d341a8484 100644
--- a/lib/mastodon/redis_config.rb
+++ b/lib/mastodon/redis_config.rb
@@ -28,7 +28,7 @@ cache_namespace = namespace ? namespace + '_cache' : 'cache'
 
 REDIS_CACHE_PARAMS = {
   driver: :hiredis,
-  url: ENV['REDIS_URL'],
+  url: ENV['CACHE_REDIS_URL'],
   expires_in: 10.minutes,
   namespace: cache_namespace,
 }.freeze