diff --git a/src/ruby/spec/channel_credentials_spec.rb b/src/ruby/spec/channel_credentials_spec.rb
index 058168a473e26bd8a5bec59dc76533b267cb7da0..e53f3162080b78002e997ca22cdf91c1018f2152 100644
--- a/src/ruby/spec/channel_credentials_spec.rb
+++ b/src/ruby/spec/channel_credentials_spec.rb
@@ -20,7 +20,7 @@ describe GRPC::Core::ChannelCredentials do
 
   def load_test_certs
     test_root = File.join(File.dirname(__FILE__), 'testdata')
-    files = ['ca.pem', 'server1.pem', 'server1.key']
+    files = ['ca.pem', 'server1.key', 'server1.pem']
     files.map { |f| File.open(File.join(test_root, f)).read }
   end