diff --git a/lib/telegram/bot/rspec/client_matchers.rb b/lib/telegram/bot/rspec/client_matchers.rb
index 76d4ca1..f2b1a13 100644
--- a/lib/telegram/bot/rspec/client_matchers.rb
+++ b/lib/telegram/bot/rspec/client_matchers.rb
@@ -117,15 +117,15 @@ module Telegram
             :arg_list_matcher, :matching_requests_count
 
           def base_message
-            "make #{expectation_type.to_s.tr('_', ' ')} #{expected_number} " \
-              "#{bot.inspect}.#{action} requests,".tap do |msg|
-              msg << " with #{arg_list_matcher}," if arg_list_matcher
-              msg << " but made #{matching_requests_count}"
-              if performed_requests
-                actual_args = performed_requests.map(&:inspect).join(', ')
-                msg << ", and #{performed_requests.count} with #{actual_args}"
-              end
+            msg = "make #{expectation_type.to_s.tr('_', ' ')} #{expected_number} " \
+              "#{bot.inspect}.#{action} requests,"
+            msg += " with #{arg_list_matcher}," if arg_list_matcher
+            msg += " but made #{matching_requests_count}"
+            if performed_requests
+              actual_args = performed_requests.map(&:inspect).join(', ')
+              msg += ", and #{performed_requests.count} with #{actual_args}"
             end
+            msg
           end
         end
 
diff --git a/lib/telegram/bot/updates_controller/log_subscriber.rb b/lib/telegram/bot/updates_controller/log_subscriber.rb
index 5c6493b..f6aa0e5 100644
--- a/lib/telegram/bot/updates_controller/log_subscriber.rb
+++ b/lib/telegram/bot/updates_controller/log_subscriber.rb
@@ -19,7 +19,7 @@ module Telegram
             payload   = event.payload
             additions = UpdatesController.log_process_action(payload)
             message = "Completed in #{event.duration.round}ms"
-            message << " (#{additions.join(' | ')})" if additions.present?
+            message += " (#{additions.join(' | ')})" if additions.present?
             message
           end
         end
diff --git a/spec/telegram/bot/rspec/client_matchers_spec.rb b/spec/telegram/bot/rspec/client_matchers_spec.rb
index c441877..68c916c 100644
--- a/spec/telegram/bot/rspec/client_matchers_spec.rb
+++ b/spec/telegram/bot/rspec/client_matchers_spec.rb
@@ -33,6 +33,9 @@ RSpec.describe Telegram::Bot::RSpec::ClientMatchers do
         args = {text: 'test', parseMode: :Markdown}
         block = ->(*) { bot.send_message(args) }
         expect(&block).to make_telegram_request(bot, :sendMessage).with(args)
+        expect do
+          expect(&block).to make_telegram_request(bot, :sendMessage).with(args.merge(extra: 1))
+        end.to raise_error RSpec::Expectations::ExpectationNotMetError
         expect(&block).to_not make_telegram_request(bot, :sendMessage).with(args.except(:text))
         expect { 3.times(&block) }.to make_telegram_request(bot, :sendMessage).
           with(args).exactly(3).times