diff --git a/Library/Homebrew/test/resource_spec.rb b/Library/Homebrew/test/resource_spec.rb
index ec21741f08..fd4e591014 100644
--- a/Library/Homebrew/test/resource_spec.rb
+++ b/Library/Homebrew/test/resource_spec.rb
@@ -157,7 +157,7 @@ describe Resource do
   end
 
   specify "#verify_download_integrity_mismatch" do
-    fn = double(file?: true)
+    fn = double(file?: true, basename: "foo")
     checksum = subject.sha256(TEST_SHA256)
 
     expect(fn).to receive(:verify_checksum).with(checksum)