diff --git a/rackstash.gemspec b/rackstash.gemspec
index 3fd1a69..573270e 100644
--- a/rackstash.gemspec
+++ b/rackstash.gemspec
@@ -5,7 +5,7 @@
 # This software may be modified and distributed under the terms
 # of the MIT license. See the LICENSE.txt file for details.
 
-lib = File.expand_path('../lib', __FILE__)
+lib = File.expand_path('lib', __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'rackstash/version'
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 57e0df9..e1c56a7 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -24,7 +24,7 @@ if ENV['COVERAGE']
   end
 end
 
-$LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
+$LOAD_PATH.unshift File.expand_path('../lib', __dir__)
 require 'rackstash'
 
 RSpec.configure do |config|