diff --git a/lbry/wallet/server/block_processor.py b/lbry/wallet/server/block_processor.py
index cc9502302..b542fa659 100644
--- a/lbry/wallet/server/block_processor.py
+++ b/lbry/wallet/server/block_processor.py
@@ -207,7 +207,7 @@ class BlockProcessor:
         self.db_deletes = []
 
         # Claimtrie cache
-        self.db_op_stack = None
+        self.db_op_stack: Optional[RevertableOpStack] = None
         self.undo_claims = []
 
         # If the lock is successfully acquired, in-memory chain state