diff --git a/lib/fakefs.rb b/lib/fakefs.rb
index 3e68f18..04f3d7d 100644
--- a/lib/fakefs.rb
+++ b/lib/fakefs.rb
@@ -107,6 +107,12 @@ module FakeFS
         end
       end
     end
+
+    def cd(dir)
+      FileSystem.chdir(dir)
+    end
+
+    alias :chdir :cd
   end
 
   class File