--simple-prompt option ignored when using pry-rails

[hurricup]

What is expected:

$ rails c
Running via Spring preloader in process 24625
Loading development environment (Rails 4.2.11)
2.4.5 :001 > 
2.4.5 :002 >   
2.4.5 :003 >   exit
$ rails c -- --simple-prompt
Running via Spring preloader in process 24924
Loading development environment (Rails 4.2.11)
>> 
?> 
?> 
?> exit

Using pry by itself:

$ pry
[1] pry(main)> 
[2] pry(main)> 
[3] pry(main)> exit
$ pry --simple-prompt
>> 
>> 
>> 
>> exit

But when I add pry-rails to the Gemfile:

$ rails c
Running via Spring preloader in process 24556
Loading development environment (Rails 4.2.11)
[1] pry(main)> 
[2] pry(main)> 
[3] pry(main)> 
[4] pry(main)> 
[5] pry(main)> exit

$ rails c -- --simple-prompt
Running via Spring preloader in process 24574
Loading development environment (Rails 4.2.11)
[1] pry(main)> 
[2] pry(main)> 
[3] pry(main)> 
[4] pry(main)> exit