diff --git a/spec/rubyspec/core/process/fixtures/common.rb b/spec/rubyspec/core/process/fixtures/common.rb
index abfd05bb18..046efa5396 100644
--- a/spec/rubyspec/core/process/fixtures/common.rb
+++ b/spec/rubyspec/core/process/fixtures/common.rb
@@ -46,7 +46,6 @@ module ProcessSpecs
         Thread.current.abort_on_exception = true
         args = [@pid_file]
         args << scenario if scenario
-        args << RUBY_EXE.inspect if scenario
         @result = ruby_exe @script, args: args
       end
       Thread.pass while @thread.status and !File.exist?(@pid_file)
diff --git a/spec/rubyspec/core/process/fixtures/kill.rb b/spec/rubyspec/core/process/fixtures/kill.rb
index 00b5223b90..0b88f8ee1f 100644
--- a/spec/rubyspec/core/process/fixtures/kill.rb
+++ b/spec/rubyspec/core/process/fixtures/kill.rb
@@ -2,7 +2,6 @@ require 'thread'
 
 pid_file = ARGV.shift
 scenario = ARGV.shift
-ruby_exe = ARGV.shift
 
 # We must do this first otherwise there will be a race with the process that
 # creates this process and the TERM signal below could go to that process
@@ -40,7 +39,7 @@ if scenario
   end
 
   code = "Process.kill(#{signal}, #{process})"
-  system(*ruby_exe.split(' '), "-e", code)
+  system(ENV["RUBY_EXE"], *ENV["RUBY_FLAGS"].split(' '), "-e", code)
 end
 
 sleep 0.001 until mutex.locked? and $signaled