diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 0761e276..64d37230 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -47,7 +47,7 @@ RSpec.configure do |config|
   config.include(CompressHelper)
   config.include(ParserHelper)
   config.include(Mutant::NodeHelpers)
-  config.mock_with :rspec do |rspec|
+  config.expect_with :rspec do |rspec|
     rspec.syntax = [:expect, :should]
   end
 end