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You have a misunderstanding about C. When you create "var" inside myfunction, you are allocating memory space for a new Cluster. The assignment to var, "var = (*parameters)->Variable[0];" copies the contents of the parameter into var. Then you modify the value of Type within that new copy of var and the original is left unchanged. It's doing exactly what's expected. Edit: note, however, that if you were to modify one of the strings within Var, it would be reflected in the original, because those are pointer types. The Type field is a value, not a pointer, so your function has two copies of it - one in the parameter, and another in var.