diff --git a/lib/sidekiq/limit_fetch/queues.rb b/lib/sidekiq/limit_fetch/queues.rb
index 9ae7e68..897e293 100644
--- a/lib/sidekiq/limit_fetch/queues.rb
+++ b/lib/sidekiq/limit_fetch/queues.rb
@@ -48,7 +48,7 @@ module Sidekiq::LimitFetch::Queues
   def namespace
     @namespace ||= Sidekiq.redis do |it|
       if it.respond_to?(:namespace) and it.namespace
-        it.namespace + ':'
+        "#{it.namespace}:"
       else
         ''
       end
diff --git a/sidekiq-limit_fetch.gemspec b/sidekiq-limit_fetch.gemspec
index 6fbef67..dceb269 100644
--- a/sidekiq-limit_fetch.gemspec
+++ b/sidekiq-limit_fetch.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new do |gem|
 
   gem.files         = `git ls-files`.split($/)
   gem.test_files    = gem.files.grep %r{^spec/}
-  gem.require_paths = 'lib'
+  gem.require_paths = %w(lib)
 
   gem.add_dependency 'sidekiq', '>= 4'
   gem.add_development_dependency 'redis-namespace', '~> 1.5', '>= 1.5.2'