diff --git a/.travis.yml b/.travis.yml
index accae0f..b2beaa9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,6 @@ script: bundle exec rake spec
 
 matrix:
   allow_failures:
-    - rvm: 1.8.7
     - rvm: jruby
     - rvm: rbx
     - rvm: ree
@@ -16,6 +15,7 @@ notifications:
       - http://dx-helper.herokuapp.com/travis
 
 rvm:
+  - 1.8.7
   - 1.9.2
   - 1.9.3
   - 2.0.0
diff --git a/Gemfile b/Gemfile
index 3470ea2..da92b31 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ platform :mingw do
   gem "win32console", "~> 1.3.0"
 end
 
-platform :jruby do
+platform :jruby, :ruby_18 do
   gem "posix-spawn", "~> 0.3.6"
 end
 
diff --git a/lib/foreman/process.rb b/lib/foreman/process.rb
index 2abcb82..c2838aa 100644
--- a/lib/foreman/process.rb
+++ b/lib/foreman/process.rb
@@ -1,4 +1,5 @@
 require "foreman"
+require "shellwords"
 
 class Foreman::Process
 
@@ -52,18 +53,10 @@ class Foreman::Process
       Dir.chdir(cwd) do
         Process.spawn env, expanded_command(env), :out => output, :err => output
       end
-    elsif Foreman.jruby_18?
+    elsif Foreman.jruby_18? || Foreman.ruby_18?
       require "posix/spawn"
-      wrapped_command = "#{Foreman.runner} -d '#{cwd}' -p -- #{command}"
-      POSIX::Spawn.spawn env, wrapped_command, :out => output, :err => output
-    elsif Foreman.ruby_18?
-      fork do
-        $stdout.reopen output
-        $stderr.reopen output
-        env.each { |k,v| ENV[k] = v }
-        wrapped_command = "#{Foreman.runner} -d '#{cwd}' -p -- #{command}"
-        Kernel.exec wrapped_command
-      end
+      wrapped_command = "#{Foreman.runner} -d '#{cwd}' -p -- #{expanded_command(env)}"
+      POSIX::Spawn.spawn(*spawn_args(env, wrapped_command.shellsplit, {:out => output, :err => output}))
     else
       wrapped_command = "#{Foreman.runner} -d '#{cwd}' -p -- #{command}"
       Process.spawn env, wrapped_command, :out => output, :err => output
@@ -122,4 +115,14 @@ class Foreman::Process
     File.expand_path(@options[:cwd] || ".")
   end
 
+private
+
+  def spawn_args(env, argv, options)
+    args = []
+    args << env
+    args += argv
+    args << options
+    args
+  end
+
 end
diff --git a/spec/foreman/process_spec.rb b/spec/foreman/process_spec.rb
index 9a189b9..f9a54e0 100644
--- a/spec/foreman/process_spec.rb
+++ b/spec/foreman/process_spec.rb
@@ -41,7 +41,7 @@ describe Foreman::Process do
 
     it "should output utf8 properly" do
       process = Foreman::Process.new(resource_path("bin/utf8"))
-      run(process).should == "\xFF\x03\n".force_encoding('binary')
+      run(process).should == (Foreman.ruby_18? ? "\xFF\x03\n" : "\xFF\x03\n".force_encoding('binary'))
     end
   end
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 70536cd..76676ee 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -21,6 +21,10 @@ def mock_error(subject, message)
   end
 end
 
+def make_pipe
+  IO.method(:pipe).arity.zero? ? IO.pipe : IO.pipe("BINARY")
+end
+
 def foreman(args)
   capture_stdout do
     begin
@@ -31,14 +35,19 @@ def foreman(args)
 end
 
 def forked_foreman(args)
-  rd, wr = IO.pipe("BINARY")
-  Process.spawn("bundle exec bin/foreman #{args}", :out => wr, :err => wr)
+  rd, wr = make_pipe
+  if Foreman.jruby_18? || Foreman.ruby_18?
+    require 'posix/spawn'
+    POSIX::Spawn.spawn({}, "bundle exec bin/foreman #{args}", :out => wr, :err => wr)
+  else
+    Process.spawn("bundle exec bin/foreman #{args}", :out => wr, :err => wr)
+  end
   wr.close
   rd.read
 end
 
 def fork_and_capture(&blk)
-  rd, wr = IO.pipe("BINARY")
+  rd, wr = make_pipe
   pid = fork do
     rd.close
     wr.sync = true
@@ -57,7 +66,12 @@ def fork_and_capture(&blk)
 end
 
 def fork_and_get_exitstatus(args)
-  pid = Process.spawn("bundle exec bin/foreman #{args}", :out => "/dev/null", :err => "/dev/null")
+  pid = if Foreman.jruby_18? || Foreman.ruby_18?
+    require 'posix/spawn'
+    POSIX::Spawn.spawn({}, "bundle exec bin/foreman #{args}", :out => "/dev/null", :err => "/dev/null")
+  else
+    Process.spawn("bundle exec bin/foreman #{args}", :out => "/dev/null", :err => "/dev/null")
+  end
   Process.wait(pid)
   $?.exitstatus
 end
@@ -141,7 +155,7 @@ end
 
 def capture_stdout
   old_stdout = $stdout.dup
-  rd, wr = IO.method(:pipe).arity.zero? ? IO.pipe : IO.pipe("BINARY")
+  rd, wr = make_pipe
   $stdout = wr
   yield
   wr.close