C++: use different integer type

When using a JSON Schema to generate C++ code, the generated class always uses int64_t for integer properties. In my other code this frequently leads to compiler warnings when I want to assign an integer property value to a C++ int, because the compiler warns about casts from int64_t to int (because we build with -Wc++11-narrowing and -Wshorten-64-to-32).

Is there a way to specify the C++ data type that should be used for a property? Then I could explicitly change the generated type to int (or short or char) where necessary.