diff --git a/src/dexorder/walker.py b/src/dexorder/walker.py
index 00bfdbd..03577e0 100644
--- a/src/dexorder/walker.py
+++ b/src/dexorder/walker.py
@@ -77,10 +77,11 @@ class BlockWalker (BlockProgressor):
                     promo_height = promotion_height(chain, latest.height)
                     while (processed_height < promo_height and
                            (config.walker_stop is None or processed_height < config.walker_stop)):
-                        cur_height = min(promo_height, processed_height+batch_size-1)
+                        start = processed_height + 1
+                        cur_height = min(promo_height, processed_height+batch_size)
                         if config.walker_stop is not None:
                             cur_height = min(cur_height, config.walker_stop)
-                        await self.handle(processed_height+1, cur_height, chain=chain, w3=w3)
+                        await self.handle(start, cur_height, chain=chain, w3=w3)
                         if self.flush_delay is None or \
                                 self.flush_type=='blocks' and last_flush + self.flush_delay <= processed_height or \
                                 self.flush_type=='time' and last_flush + self.flush_delay <= now():