diff --git a/spec/ruby/core/process/ppid_spec.rb b/spec/ruby/core/process/ppid_spec.rb
index 7d22755c77..47c32a8591 100644
--- a/spec/ruby/core/process/ppid_spec.rb
+++ b/spec/ruby/core/process/ppid_spec.rb
@@ -1,7 +1,9 @@
 require_relative '../../spec_helper'
 
 describe "Process.ppid" do
-  it "returns the process id of the parent of this process" do
-    ruby_exe("puts Process.ppid").should == "#{Process.pid}\n"
+  platform_is_not :windows do
+    it "returns the process id of the parent of this process" do
+      ruby_exe("puts Process.ppid").should == "#{Process.pid}\n"
+    end
   end
 end