diff --git a/Rakefile b/Rakefile
index 289b504..c28e4a4 100644
--- a/Rakefile
+++ b/Rakefile
@@ -5,17 +5,30 @@ require 'rspec/core/rake_task'
 RSpec::Core::RakeTask.new(:spec)
 task :default => :spec
 
+require 'rbconfig'
 namespace(:spec) do
-  desc "Run all specs on multiple ruby versions (requires rvm)"
-  task(:portability) do
-    %w[1.8.7 1.9.2 ree].each do |version|
-      system <<-BASH
-        bash -c 'source ~/.rvm/scripts/rvm;
-                 rvm #{version};
-                 echo "--------- version #{version} ----------\n";
-                 bundle install;
-                 rake spec'
-      BASH
+  if Config::CONFIG['host_os'] =~ /mswin|mingw/i
+    desc "Run all specs on multiple ruby versions (requires pik)"
+    task(:portability) do
+      %w[187 192 161].each do |version|
+         system "cmd /c echo -----------#{version}------------ & " +
+           "pik use #{version} & " +
+           "bundle install & " +
+           "rake spec"
+      end
     end
-  end
+  else
+    desc "Run all specs on multiple ruby versions (requires rvm)"
+    task(:portability) do
+      %w[1.8.7 1.9.2 ree].each do |version|
+        system <<-BASH
+          bash -c 'source ~/.rvm/scripts/rvm;
+                   rvm #{version};
+                   echo "--------- version #{version} ----------\n";
+                   bundle install;
+                   rake spec'
+        BASH
+      end
+    end
+  end  
 end
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