diff --git a/dynatrace_extension/sdk/extension.py b/dynatrace_extension/sdk/extension.py
index 95a2e36..3a0c633 100644
--- a/dynatrace_extension/sdk/extension.py
+++ b/dynatrace_extension/sdk/extension.py
@@ -1070,7 +1070,7 @@ def _send_events(self, events: Union[dict, List[dict]], send_immediately: bool =
             elif isinstance(events, list):
                 self._logs.extend(events)
             else:
-                self.logger.error(f'Invalid log format: {events}')
+                self.logger.error(f"Invalid log format: {events}")
 
     def _send_buffered_events(self):
         with self._logs_lock:
diff --git a/tests/sdk/test_extension.py b/tests/sdk/test_extension.py
index fd8d0fa..05bd2f7 100644
--- a/tests/sdk/test_extension.py
+++ b/tests/sdk/test_extension.py
@@ -67,7 +67,7 @@ def test_add_event(self):
         extension.report_event("my_event1", "my_description")
         extension.report_event("my_event1", "my_description")
         self.assertEqual(len(extension._logs), 2)
-        self.assertEqual(extension._logs[0].get("content", "not_good"), f"my_event1\nmy_description")
+        self.assertEqual(extension._logs[0].get("content", "not_good"), "my_event1\nmy_description")
 
     def test_send_event_immediately(self):
         extension = Extension()