diff --git a/src/Storages/MergeTree/MergeTreePartition.cpp b/src/Storages/MergeTree/MergeTreePartition.cpp
index c1c50b8031c..83efbca9d77 100644
--- a/src/Storages/MergeTree/MergeTreePartition.cpp
+++ b/src/Storages/MergeTree/MergeTreePartition.cpp
@@ -214,7 +214,7 @@ static bool moduloToModuloLegacyRecursive(ASTPtr node_expr)
         if (function_expr->arguments)
         {
             auto children = function_expr->arguments->children;
-            for (auto child : children)
+            for (const auto & child : children)
                 modulo_in_partition_key |= moduloToModuloLegacyRecursive(child);
         }
     }