diff --git a/bumble/smp.py b/bumble/smp.py
index 8c0c50a5..abcbd67a 100644
--- a/bumble/smp.py
+++ b/bumble/smp.py
@@ -498,7 +498,7 @@ class PairingDelegate:
     DISPLAY_OUTPUT_ONLY = SMP_DISPLAY_ONLY_IO_CAPABILITY
     DISPLAY_OUTPUT_AND_YES_NO_INPUT = SMP_DISPLAY_YES_NO_IO_CAPABILITY
     DISPLAY_OUTPUT_AND_KEYBOARD_INPUT = SMP_KEYBOARD_DISPLAY_IO_CAPABILITY
-    DEFAULT_KEY_DISTRIBUTION = (
+    DEFAULT_KEY_DISTRIBUTION: int = (
         SMP_ENC_KEY_DISTRIBUTION_FLAG | SMP_ID_KEY_DISTRIBUTION_FLAG
     )