diff --git a/test/openssl/test_x509cert.rb b/test/openssl/test_x509cert.rb
index 818b784b6c..d696b98c0a 100644
--- a/test/openssl/test_x509cert.rb
+++ b/test/openssl/test_x509cert.rb
@@ -316,7 +316,7 @@ class OpenSSL::TestX509Certificate < OpenSSL::TestCase
     fullchain_path = Fixtures.file_path("pkey", "garbage.txt")
 
     assert_raise(OpenSSL::X509::CertificateError) do
-      certificates = OpenSSL::X509::Certificate.load_file(fullchain_path)
+      OpenSSL::X509::Certificate.load_file(fullchain_path)
     end
   end