diff --git a/Library/Homebrew/test/language/python/virtualenv_spec.rb b/Library/Homebrew/test/language/python/virtualenv_spec.rb
index c49decda29..5babc4a240 100644
--- a/Library/Homebrew/test/language/python/virtualenv_spec.rb
+++ b/Library/Homebrew/test/language/python/virtualenv_spec.rb
@@ -9,10 +9,10 @@ describe Language::Python::Virtualenv::Virtualenv, :needs_python do
 
   let(:dir) { mktmpdir }
 
-  let(:resource) { double("resource", stage: true) }
+  let(:resource) { instance_double(Resource, "resource", stage: true) }
   let(:formula_bin) { dir/"formula_bin" }
   let(:formula_man) { dir/"formula_man" }
-  let(:formula) { double("formula", resource: resource, bin: formula_bin, man: formula_man) }
+  let(:formula) { instance_double(Formula, "formula", resource: resource, bin: formula_bin, man: formula_man) }
 
   describe "#create" do
     it "creates a venv" do