diff --git a/lib/gepub/book.rb b/lib/gepub/book.rb
index d003ba6..40ff37f 100644
--- a/lib/gepub/book.rb
+++ b/lib/gepub/book.rb
@@ -102,14 +102,14 @@ def self.parse(io)
       package = nil
       package_path = nil
       book = nil
-      Zip::File.open_buffer(io) {
+      Zip::File.open_buffer(io) do
         |zip_file|
         package, package_path = parse_container(zip_file, files)
         check_consistency_of_package(package, package_path)
         parse_files_into_package(files, package)
         book = Book.new(package.path)
         book.instance_eval { @package = package; @optional_files = files }
-      }
+      end
       book
     end
 
diff --git a/spec/gepub_spec.rb b/spec/gepub_spec.rb
index 2714bc5..4015157 100644
--- a/spec/gepub_spec.rb
+++ b/spec/gepub_spec.rb
@@ -2,6 +2,7 @@
 require File.dirname(__FILE__) + '/spec_helper.rb'
 require 'rubygems'
 require 'nokogiri'
+require 'rbconfig'
 
 describe GEPUB::Item do
   it "should return atttributes" do
@@ -79,7 +80,12 @@
     end
 
     after do
-      FileUtils.remove_entry_secure @tempdir
+      if RbConfig::CONFIG['host_os'] =~ /mswin/
+        # workaround; rubyzip opened files could not be deleted with remove_entry_secure on windows.
+        FileUtils.rm_rf @tempdir
+      else
+        FileUtils.remove_entry_secure @tempdir
+      end
     end
     
     it "should have title"  do