diff --git a/spec/command_spec.rb b/spec/command_spec.rb
index <HASH>..<HASH> 100644
--- a/spec/command_spec.rb
+++ b/spec/command_spec.rb
@@ -20,6 +20,7 @@ describe GitHub::Command do
   end
 
   it "should successfully call out to the shell" do
+    class_unguard(Open3, :popen3)
     hi = @command.sh("echo hi")
     hi.should == "hi"
     hi.out?.should be(true)
Unguard Open3.popen3 when we're testing the GitHub::Command#sh method