diff --git a/e_paper.gemspec b/e_paper.gemspec
index f9398aa..e1be13f 100644
--- a/e_paper.gemspec
+++ b/e_paper.gemspec
@@ -1,4 +1,4 @@
-$:.push File.expand_path("lib", __FILE__)
+$:.push File.expand_path("lib", __dir__)
 
 # Maintain your gem's version:
 require "e_paper/version"