diff --git a/dbms/src/DataTypes/DataTypeFixedString.cpp b/dbms/src/DataTypes/DataTypeFixedString.cpp
index 17e069d2084..cac908d515f 100644
--- a/dbms/src/DataTypes/DataTypeFixedString.cpp
+++ b/dbms/src/DataTypes/DataTypeFixedString.cpp
@@ -45,7 +45,7 @@ void DataTypeFixedString::serializeBinary(const IColumn & column, WriteBuffer &
 	if (limit == 0 || offset + limit > size)
 		limit = size - offset;
 
-	ostr.write(reinterpret_cast<const char *>(&data[offset]), n * limit);
+	ostr.write(reinterpret_cast<const char *>(&data[n * offset]), n * limit);
 }