diff --git a/squeaknode/db/squeak_db.py b/squeaknode/db/squeak_db.py
index e6477af8..b3a6e7ac 100644
--- a/squeaknode/db/squeak_db.py
+++ b/squeaknode/db/squeak_db.py
@@ -1248,7 +1248,7 @@ class SqueakDb:
         with self.get_connection() as connection:
             connection.execute(stmt)
 
-    def get_latest_settle_index(self):
+    def get_latest_settle_index(self) -> Optional[int]:
         """ Get the lnd settled index of the most recent received payment. """
         s = select(
             [func.max(self.received_payments.c.settle_index)],
diff --git a/squeaknode/node/payment_processor.py b/squeaknode/node/payment_processor.py
index ce742a48..f9a23d25 100644
--- a/squeaknode/node/payment_processor.py
+++ b/squeaknode/node/payment_processor.py
@@ -111,7 +111,7 @@ class PaymentProcessorTask:
                 )
                 self.stopped.wait(self.retry_s)
 
-    def get_latest_settle_index(self):
+    def get_latest_settle_index(self) -> int:
         return self.squeak_db.get_latest_settle_index() or 0
 
     def get_sent_offer_for_payment_hash(self, payment_hash: bytes) -> SentOffer: