diff --git a/newrelic/api/log.py b/newrelic/api/log.py
index bb710e524..8a33534b7 100644
--- a/newrelic/api/log.py
+++ b/newrelic/api/log.py
@@ -89,10 +89,11 @@ def log_record_to_dict(cls, record):
         output.update(get_linking_metadata())
 
         DEFAULT_LOG_RECORD_KEYS = cls.DEFAULT_LOG_RECORD_KEYS
-        if len(record.__dict__) > len(DEFAULT_LOG_RECORD_KEYS):
-            for key in record.__dict__:
-                if key not in DEFAULT_LOG_RECORD_KEYS:
-                    output["extra." + key] = getattr(record, key)
+        # If any keys are present in record that aren't in the default,
+        # add them to the output record.
+        keys_to_add = set(record.__dict__.keys()) - DEFAULT_LOG_RECORD_KEYS
+        for key in keys_to_add:
+            output["extra." + key] = getattr(record, key)
 
         if record.exc_info:
             output.update(format_exc_info(record.exc_info))
diff --git a/tests/agent_features/test_logs_in_context.py b/tests/agent_features/test_logs_in_context.py
index 8693c0f08..8f97ee226 100644
--- a/tests/agent_features/test_logs_in_context.py
+++ b/tests/agent_features/test_logs_in_context.py
@@ -61,6 +61,48 @@ def __str__(self):
     __repr__ = __str__
 
 
+def test_newrelic_logger_min_extra_keys_no_error(log_buffer):
+    extra = {
+        "string": "foo",
+    }
+    _logger.info("Hello %s", "World", extra=extra)
+
+    log_buffer.seek(0)
+    message = json.load(log_buffer)
+
+    timestamp = message.pop("timestamp")
+    thread_id = message.pop("thread.id")
+    process_id = message.pop("process.id")
+    filename = message.pop("file.name")
+    line_number = message.pop("line.number")
+
+    assert isinstance(timestamp, int)
+    assert isinstance(thread_id, int)
+    assert isinstance(process_id, int)
+    assert filename.endswith("/test_logs_in_context.py")
+    assert isinstance(line_number, int)
+
+    expected = {
+        "entity.name": "Python Agent Test (agent_features)",
+        "entity.type": "SERVICE",
+        "message": "Hello World",
+        "log.level": "INFO",
+        "logger.name": "test_logs_in_context",
+        "thread.name": "MainThread",
+        "process.name": "MainProcess",
+        "extra.string": "foo",
+    }
+    expected_extra_txn_keys = (
+        "entity.guid",
+        "hostname",
+    )
+
+    for k, v in expected.items():
+        assert message.pop(k) == v
+
+    assert set(message.keys()) == set(expected_extra_txn_keys)
+
+
 def test_newrelic_logger_no_error(log_buffer):
     extra = {
         "string": "foo",