diff --git a/src/Storages/MergeTree/MergeTreeRangeReader.cpp b/src/Storages/MergeTree/MergeTreeRangeReader.cpp
index fcac5bc2c59..0b3765adc6a 100644
--- a/src/Storages/MergeTree/MergeTreeRangeReader.cpp
+++ b/src/Storages/MergeTree/MergeTreeRangeReader.cpp
@@ -484,7 +484,7 @@ void MergeTreeRangeReader::ReadResult::addFilter(const ColumnPtr & new_filter)
                 throw Exception("addFilter function expected ColumnUInt8.", ErrorCodes::LOGICAL_ERROR);
 
             const auto & data = filter->getData();
-            auto * it = data.begin();
+            const auto * it = data.begin();
 
             auto & new_data = new_mutable_holder_cast->getData();
             auto * n_it = new_data.begin();