diff --git a/CHANGELOG.md b/CHANGELOG.md
index 68d274fd..33c01fe1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed:
+
+- fixed a bug where `log_prefix` can only be a string [#393](https://github.com/Draegerwerk/sdc11073/issues/393)
+
 ## [2.1.0] - 2024-09-04
 
 ### Added
diff --git a/src/sdc11073/loghelper.py b/src/sdc11073/loghelper.py
index 44b61dd3..8639cc8f 100644
--- a/src/sdc11073/loghelper.py
+++ b/src/sdc11073/loghelper.py
@@ -69,7 +69,7 @@ def __init__(self, logger, prefix=None):
 
     def _process(self, msg, args, kwargs):
         try:
-            _msg = self.log_prefix + msg
+            _msg = f'{self.log_prefix}{msg}'
         except TypeError:
             _msg = msg
 
diff --git a/tests/test_loghelper.py b/tests/test_loghelper.py
index 084d5800..a0d7a386 100644
--- a/tests/test_loghelper.py
+++ b/tests/test_loghelper.py
@@ -1,5 +1,7 @@
 import logging
 import unittest
+import uuid
+from unittest import mock
 
 from sdc11073 import loghelper
 
@@ -47,3 +49,15 @@ def test_logwatcher(self):
         records = lw2.getAllRecords()
         self.assertEqual(len(records), 1)
         self.assertRaises(loghelper.LogWatchError, lw2.check)
+
+    def test_ident_parameter(self):
+        def _test_prefix(prefix):
+            adapter = loghelper.LoggerAdapter(logger=mock.MagicMock(), prefix=prefix)
+            msg = uuid.uuid4()
+            processed_msg = adapter._process(msg, (), ())
+            self.assertEqual(f'{prefix or ""}{msg}', processed_msg)
+
+        _test_prefix(1)
+        _test_prefix('1')
+        _test_prefix(mock.MagicMock())
+        _test_prefix(None)