diff --git a/spec/bundler/dsl_spec.rb b/spec/bundler/dsl_spec.rb
index 40739a431b8..8252367f992 100644
--- a/spec/bundler/dsl_spec.rb
+++ b/spec/bundler/dsl_spec.rb
@@ -192,6 +192,7 @@
       let(:platform) { "ruby" }
 
       it "keeps track of the ruby platforms in the dependency" do
+        allow(Gem::Platform).to receive(:local).and_return(rb)
         subject.gemspec
         expect(subject.dependencies.last.platforms).to eq(Bundler::Dependency::REVERSE_PLATFORM_MAP[Gem::Platform::RUBY])
       end