diff --git a/lib/vagrant/hosts/bsd.rb b/lib/vagrant/hosts/bsd.rb
index ef465fae1..ac6b17fdb 100644
--- a/lib/vagrant/hosts/bsd.rb
+++ b/lib/vagrant/hosts/bsd.rb
@@ -42,7 +42,7 @@ module Vagrant
           if $?.to_i == 0
             # Use sed to just strip out the block of code which was inserted
             # by Vagrant
-            system("sudo sed -e '/^# VAGRANT-BEGIN: #{env.vm.uuid}/,/^# VAGRANT-END: #{env.vm.uuid}/ d' -i bak /etc/exports")
+            system("sudo sed -e '/^# VAGRANT-BEGIN: #{env.vm.uuid}/,/^# VAGRANT-END: #{env.vm.uuid}/ d' -ibak /etc/exports")
           end
         end
       end