diff --git a/dbms/src/Functions/FunctionBinaryArithmetic.h b/dbms/src/Functions/FunctionBinaryArithmetic.h
index b3db857dc0f..66eb7be01cb 100644
--- a/dbms/src/Functions/FunctionBinaryArithmetic.h
+++ b/dbms/src/Functions/FunctionBinaryArithmetic.h
@@ -584,7 +584,7 @@ class FunctionBinaryArithmetic : public IFunction
         std::string function_name;
         if (interval_data_type)
         {
-            function_name = (function_is_plus ? "add" : "subtract") + interval_data_type->getKind().toString() + 's';
+            function_name = String(function_is_plus ? "add" : "subtract") + interval_data_type->getKind().toString() + 's';
         }
         else
         {
@@ -594,7 +594,7 @@ class FunctionBinaryArithmetic : public IFunction
                 function_name = function_is_plus ? "addSeconds" : "subtractSeconds";
         }
 
-        return FunctionFactory::instance().get(function_name.str(), context);
+        return FunctionFactory::instance().get(function_name, context);
     }
 
     bool isAggregateMultiply(const DataTypePtr & type0, const DataTypePtr & type1) const