diff --git a/src/Storages/StorageTableFunction.h b/src/Storages/StorageTableFunction.h
index d44133a1a89..4f9ca5d5858 100644
--- a/src/Storages/StorageTableFunction.h
+++ b/src/Storages/StorageTableFunction.h
@@ -142,6 +142,7 @@ public:
 
     StoragePolicyPtr getStoragePolicy() const override
     {
+        std::lock_guard lock{nested_mutex};
         if (nested)
             return StorageProxy::getStoragePolicy();
         return IStorage::getStoragePolicy();