diff --git a/src/Storages/MergeTree/MergeTreeReadPoolParallelReplicasInOrder.cpp b/src/Storages/MergeTree/MergeTreeReadPoolParallelReplicasInOrder.cpp
index 567514deec8..f08c34ea3ea 100644
--- a/src/Storages/MergeTree/MergeTreeReadPoolParallelReplicasInOrder.cpp
+++ b/src/Storages/MergeTree/MergeTreeReadPoolParallelReplicasInOrder.cpp
@@ -108,7 +108,7 @@ MergeTreeReadTaskPtr MergeTreeReadPoolParallelReplicasInOrder::getTask(size_t ta
                             if (marks_in_range > max_marks_in_range)
                                 split = true;
                         }
-                        result.emplace_back(range.begin, range.begin + marks_in_range);
+                        result.emplace_back(range.begin, range.end);
                     }
                     chassert(!result.empty());
                     desc.ranges = MarkRanges{};