diff --git a/src/Storages/MergeTree/IMergeTreeReader.cpp b/src/Storages/MergeTree/IMergeTreeReader.cpp
index 41de5784d55..d0d845ed6a3 100644
--- a/src/Storages/MergeTree/IMergeTreeReader.cpp
+++ b/src/Storages/MergeTree/IMergeTreeReader.cpp
@@ -138,8 +138,8 @@ void IMergeTreeReader::fillMissingColumns(Columns & res_columns, bool & should_e
                 const auto * array_type = typeid_cast<const DataTypeArray *>(type.get());
                 if (offset_it != offset_columns.end() && array_type)
                 {
+                    const auto & nested_type = array_type->getNestedType();
                     ColumnPtr offsets_column = offset_it->second;
-                    DataTypePtr nested_type = array_type->getNestedType();
                     size_t nested_rows = typeid_cast<const ColumnUInt64 &>(*offsets_column).getData().back();
 
                     ColumnPtr nested_column =