diff --git a/lib/awesome_print/inspector.rb b/lib/awesome_print/inspector.rb
index 4d0ee71..1193757 100644
--- a/lib/awesome_print/inspector.rb
+++ b/lib/awesome_print/inspector.rb
@@ -175,7 +175,7 @@ module AwesomePrint
     # Load ~/.aprc file with custom defaults that override default options.
     #------------------------------------------------------------------------------
     def merge_custom_defaults!
-      dotfile = File.join(ENV["HOME"], ".aprc")
+      dotfile = File.join(ENV['HOME'], '.aprc')
       load dotfile if File.readable?(dotfile)
       merge_options!(AwesomePrint.defaults) if AwesomePrint.defaults.is_a?(Hash)
     rescue => e
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 3b564bd..b9d65c2 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -71,7 +71,8 @@ def normalize_object_id_strings(str, options)
 end
 
 def stub_dotfile!
-  dotfile = File.join(ENV["HOME"], ".aprc")
+  dotfile = File.join(ENV['HOME'], '.aprc')
+  allow(File).to receive(:readable?).and_call_original
   expect(File).to receive(:readable?).at_least(:once).with(dotfile).and_return(false)
 end