diff --git a/filesystem/realpath.markdown b/filesystem/realpath.markdown
index 67f657d..e012603 100644
--- a/filesystem/realpath.markdown
+++ b/filesystem/realpath.markdown
@@ -8,7 +8,8 @@
 }}
 
 {{code:ruby
-    abs_path = File.expand_path('../to/foobar')
+    require 'pathname'
+    abs_path = Pathname.new('../to/foobar').realpath.to_s
     p abs_path
 
     #=> "/absolute/path/to/foobar"