Ability to choose simulink coder structure names in generated .h files for R2013B

I am running R2013B to turn a .mdl file into C code. As part of our conversion, we rely upon pulling information from the generated headers, using comments and struct naming (legacy code and we're stuck on R2013B). For example, our generated header normally has the following naming, for our model XYZ:

/* Parameters (auto storage) */

struct XYZ_Parameters_ {

...

After making a model change, the text is slightly different:

/* Parameters (auto storage) */

struct XYZ_P_ {

...

Is there some place within the config settings that determines how long the name should be or somehow limits the length of these? I've gone through the C generation/diagnostic settings and nothing stood out to me. I've made a lot of SIMULINK changes to the .mdl, but I don't recall altering anything that I think would have changed this. Any ideas?

Thanks,

K