diff --git a/dbms/include/DB/Common/CombinedCardinalityEstimator.h b/dbms/include/DB/Common/CombinedCardinalityEstimator.h
index 269c279bdad..3c43a90261b 100644
--- a/dbms/include/DB/Common/CombinedCardinalityEstimator.h
+++ b/dbms/include/DB/Common/CombinedCardinalityEstimator.h
@@ -155,15 +155,9 @@ public:
 		if (container_type == details::ContainerType::SMALL)
 			small.read(in);
 		else if (container_type == details::ContainerType::MEDIUM)
-		{
-			toMedium();
 			getContainer<Medium>().read(in);
-		}
 		else if (container_type == details::ContainerType::LARGE)
-		{
-			toLarge();
 			getContainer<Large>().read(in);
-		}
 	}
 
 	void readAndMerge(DB::ReadBuffer & in)