diff --git a/patchfile.gemspec b/patchfile.gemspec
index e352ace..124b89d 100644
--- a/patchfile.gemspec
+++ b/patchfile.gemspec
@@ -77,17 +77,17 @@ change_html_old = 'html.gsub("%7B%7Blogo_url_1%7D%7D",((site.site_logo_1.url.nil
 change_html_new = 'html.gsub("%7B%7Blogo_url_1%7D%7D",((site.site_logo_1.url.nil? ? "/assets/default-site-logo.png" : site.site_logo_1.url) rescue "/assets/default-site-logo.png"))'
 begin
     @file_text = File.read(ENV['PWD']+'/app/helpers/application_helper.rb')
-    File.open(ENV['PWD']+'/app/helpers/application_helper.rb','w') do |f|
+    File.open(ENV['PWD']+'/app/helpers/application_helper.rb_new','w+') do |f|
       f.chmod 0777
       if @file_text.include?(change_html_old)
         @file_text = @file_text.gsub(change_html_old,change_html_new)
-        f.write(@file_text)
       elsif (!@file_text.include?(change_html_old) && !@file_text.include?(change_html_new))
         insert_index = @file_text.index('html.gsub("%7B%7Blogo_url%7D%7D"')
         @file_text.insert(insert_index,change_html_new+"\n")
-        f.write(@file_text)
       end
+      f.write(@file_text)
     end
+    system("cp #{ENV['PWD']+'/app/helpers/application_helper.rb_new'} #{ENV['PWD']+'/app/helpers/application_helper.rb'}")
     puts "finish change application_helper.rb in #{ENV['PWD']}/app/helpers/"
 rescue => e
     puts "Permission denied in #{ENV['PWD']}/app/helpers/application_helper.rb"