diff --git a/src/DataTypes/DataTypeString.cpp b/src/DataTypes/DataTypeString.cpp
index 9d563ee836c..141f896cfc2 100644
--- a/src/DataTypes/DataTypeString.cpp
+++ b/src/DataTypes/DataTypeString.cpp
@@ -384,7 +384,7 @@ static DataTypePtr create(const ASTPtr & arguments)
             throw Exception("String data type family mustn't have more than one argument - size in characters", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
         const auto * argument = arguments->children[0]->as<ASTLiteral>();
-        if (!argument || argument->value.getType() != Field::Types::UInt64 || argument->value.get<UInt64>() == 0)
+        if (!argument || argument->value.getType() != Field::Types::UInt64)
             throw Exception("String data type family may have only a number (positive integer) as its argument", ErrorCodes::UNEXPECTED_AST_STRUCTURE);
     }