diff --git a/lib/midi-smtp-server.rb b/lib/midi-smtp-server.rb
index b12dc3d..1bbbacd 100644
--- a/lib/midi-smtp-server.rb
+++ b/lib/midi-smtp-server.rb
@@ -143,15 +143,21 @@ def workers?
     # before joining the server threads, check and wait optionally a few seconds
     # to let the service(s) come up
     def join(sleep_seconds_before_join: 1)
+      # set process name
+      $0 = "[MidiSmtp] #{ARGV.join(' ')} (main)"
       # check already existing TCPServers
       return if @tcp_servers.empty?
       # check number of processes to pre-fork
 
       if pre_fork?
         # create a number of pre-fork processes and attach and join threads within workers
+        idx = 0
         @pre_fork.times do
           # append worker pid to list of workers
           @workers << fork do
+            # set forked process name
+            $0 = "[MidiSmtp] #{ARGV.join(' ')} (worker #{idx})"
+            idx += 1
             # set state for a forked process
             @is_forked = true
             # just attach and join the threads to forked worker process
diff --git a/test/integration/io_waitreadable_test.rb b/test/integration/io_waitreadable_test.rb
index d9d481e..bde67bf 100644
--- a/test/integration/io_waitreadable_test.rb
+++ b/test/integration/io_waitreadable_test.rb
@@ -50,7 +50,7 @@ def io_waitreadable_sleep
   def test_slow_io_waitreadable_sleep
     # This test hits IO::WaitReadable exception multiple times
     # For that, this test must run longer than 1 second
-    assert measure_io_waitreadable_sleep > 1
+    assert_operator measure_io_waitreadable_sleep, :>, 1
   end
 
 end
@@ -67,7 +67,7 @@ def io_waitreadable_sleep
   def test_fast_io_waitreadable_sleep
     # This test hits IO::WaitReadable exception multiple times
     # For that, this test must run longer than 1 second
-    assert measure_io_waitreadable_sleep < 1
+    assert_operator measure_io_waitreadable_sleep, :<, 1
   end
 
 end