Function/Macro argument difference

The macro: #define access(ptr, offset) ((void*)((char*)ptr + (offset * size)))

The call: access(out_buffer, item_counter0 + item_counter1)

Spot the error!

The expansion: ((void*)((char*)out_buffer + (item_counter0 + item_counter1 * size)))

"(item_counter0 + item_counter1 * size)" - Operator precedence!