diff --git a/src/AggregateFunctions/AggregateFunctionDeltaSumTimestamp.cpp b/src/AggregateFunctions/AggregateFunctionDeltaSumTimestamp.cpp
index 79f0f2b328e..9eb005706c0 100644
--- a/src/AggregateFunctions/AggregateFunctionDeltaSumTimestamp.cpp
+++ b/src/AggregateFunctions/AggregateFunctionDeltaSumTimestamp.cpp
@@ -186,7 +186,7 @@ public:
 
 
 template <typename FirstType, template <typename, typename> class AggregateFunctionTemplate, typename... TArgs>
-static IAggregateFunction * createWithTwoTypesSecond(const IDataType & second_type, TArgs && ... args)
+IAggregateFunction * createWithTwoTypesSecond(const IDataType & second_type, TArgs && ... args)
 {
     WhichDataType which(second_type);
 
@@ -203,7 +203,7 @@ static IAggregateFunction * createWithTwoTypesSecond(const IDataType & second_ty
 }
 
 template <template <typename, typename> class AggregateFunctionTemplate, typename... TArgs>
-static IAggregateFunction * createWithTwoTypes(const IDataType & first_type, const IDataType & second_type, TArgs && ... args)
+IAggregateFunction * createWithTwoTypes(const IDataType & first_type, const IDataType & second_type, TArgs && ... args)
 {
     WhichDataType which(first_type);