running "ruby" inside a rake task ignores JRUBY_OPTS

I have a script called "works.rb". It's code is pretty simple:

require 'jruby/profiler'

profile_data = JRuby::Profiler.profile do
1000.times do |n| Hash.new end
end

profile_printer = JRuby::Profiler::GraphProfilePrinter.new(profile_data)
profile_printer.printProfile(STDOUT)}}

If I run export JRUBY_OPTS="--profile.api" && ruby works.rb everything works as expected. Here's the output:

Profiling enabled; ^C shutdown will now dump profile info

Total time: 0.02

%total %self total self children calls name
---------------------------------------------------------------------------------------------------------
100% 0% 0.02 0.00 0.02 1 (top)
0.02 0.01 0.01 1/1 Fixnum#times
---------------------------------------------------------------------------------------------------------
0.02 0.01 0.01 1/1 (top)
100% 43% 0.02 0.01 0.01 1 Fixnum#times
0.01 0.01 0.00 1000/1000 Class#new
---------------------------------------------------------------------------------------------------------
0.01 0.01 0.00 1000/1000 Fixnum#times
56% 38% 0.01 0.01 0.00 1000 Class#new
0.00 0.00 0.00 1000/1000 Hash#initialize
---------------------------------------------------------------------------------------------------------
0.00 0.00 0.00 1000/1000 Class#new
18% 18% 0.00 0.00 0.00 1000 Hash#initialize

However, JRUBY_OPTS gets ignored when running "works.rb" inside a rake task. I have the following Rakefile:

task :fails do
ruby "works.rb"
end

Running export JRUBY_OPTS="--profile.api" && rake fails returns:

Profiling enabled; ^C shutdown will now dump profile info
(in /home/goncalossilva/Desktop)

• • Invoke fails (first_time)
  • Execute fails
    /home/goncalossilva/.rvm/rubies/jruby-1.6.0/bin/jruby works.rb

Total time: 0.00

%total %self total self children calls name
---------------------------------------------------------------------------------------------------------
100% 100% 0.00 0.00 0.00 0 (top)