diff --git a/lib/logstasher/railtie.rb b/lib/logstasher/railtie.rb
index 8b20515..b6f00a5 100644
--- a/lib/logstasher/railtie.rb
+++ b/lib/logstasher/railtie.rb
@@ -8,7 +8,7 @@ class Railtie < Rails::Railtie
     config.logstasher.enabled = false
 
     initializer :logstasher, :before => :load_config_initializers do |app|
-      app.config.action_dispatch.rack_cache[:verbose] = false if app.config.action_dispatch.rack_cache
+      app.config.action_dispatch.rack_cache[:verbose] = false if rack_cache_hashlike?(app)
       LogStasher.setup_before(app.config.logstasher) if app.config.logstasher.enabled
     end
 
@@ -18,4 +18,9 @@ class Railtie < Rails::Railtie
       end
     end
   end
+
+  def rack_cache_hashlike?(app)
+    app.config.action_dispatch.rack_cache && app.config.action_dispatch.rack_cache.respond_to?(:[]=)
+  end
+  private_class_method :rack_cache_hashlike?
 end