diff --git a/bumble/smp.py b/bumble/smp.py
index 7b910d1..3580937 100644
--- a/bumble/smp.py
+++ b/bumble/smp.py
@@ -764,7 +764,11 @@ class Session:
         self.peer_io_capability = SMP_NO_INPUT_NO_OUTPUT_IO_CAPABILITY
 
         # OOB
-        self.oob_data_flag = 0 if pairing_config.oob.peer_data is None else 1
+        self.oob_data_flag = 0
+        if pairing_config.oob is not None:
+            if pairing_config.oob.peer_data is not None:
+                self.oob_data_flag = 1
+
 
         # Set up addresses
         self_address = connection.self_resolvable_address or connection.self_address