diff --git a/lib/fakefs/file.rb b/lib/fakefs/file.rb
index 6c03f74..d9dac53 100644
--- a/lib/fakefs/file.rb
+++ b/lib/fakefs/file.rb
@@ -1,3 +1,5 @@
+require 'stringio'
+
 module FakeFS
   class File < StringIO
     PATH_SEPARATOR = '/'
diff --git a/lib/fakefs/safe.rb b/lib/fakefs/safe.rb
index 09a2bbb..a1b804c 100644
--- a/lib/fakefs/safe.rb
+++ b/lib/fakefs/safe.rb
@@ -1,6 +1,5 @@
 require 'fileutils'
 require 'pathname'
-require 'stringio'
 require 'fakefs/base'
 require 'fakefs/fake/file'
 require 'fakefs/fake/dir'