diff --git a/bumble/rfcomm.py b/bumble/rfcomm.py
index 5920eb0..02c18fa 100644
--- a/bumble/rfcomm.py
+++ b/bumble/rfcomm.py
@@ -129,8 +129,12 @@ RFCOMM_DYNAMIC_CHANNEL_NUMBER_END   = 30
 
 # -----------------------------------------------------------------------------
 def make_service_sdp_records(
-    service_record_handle: int, channel: int, uuid: UUID = None
+    service_record_handle: int, channel: int, uuid: Optional[UUID] = None
 ) -> List[ServiceAttribute]:
+    """
+    Create SDP records for an RFComm service given a channel number and an
+    optional UUID. A Service Class Attribute is included only if the UUID is not None.
+    """
     records = [
         ServiceAttribute(
             SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
@@ -160,7 +164,7 @@ def make_service_sdp_records(
         records.append(
             ServiceAttribute(
                 SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
-                DataElement.sequence([DataElement.uuid(UUID(uuid))]),
+                DataElement.sequence([DataElement.uuid(uuid)]),
             )
         )
 
diff --git a/examples/run_rfcomm_server.py b/examples/run_rfcomm_server.py
index 0e7e72e..41915a4 100644
--- a/examples/run_rfcomm_server.py
+++ b/examples/run_rfcomm_server.py
@@ -20,6 +20,7 @@ import sys
 import os
 import logging
 
+from bumble.core import UUID
 from bumble.device import Device
 from bumble.transport import open_transport_or_link
 from bumble.rfcomm import Server
@@ -32,7 +33,7 @@ def sdp_records(channel, uuid):
     service_record_handle = 0x00010001
     return {
         service_record_handle: make_service_sdp_records(
-            service_record_handle, channel, uuid
+            service_record_handle, channel, UUID(uuid)
         )
     }