How to debug (gdb) a binary that is invoked with xvfb-run?

I have a binary that I usually run as follows:

$ xvfb-run ./bin --param1 foo

However, now that I need to debug it using GDB, I'm not able to do:

$ gdb --args xvfb-run ./bin --param1 foo

because "/usr/bin/xvfb-run": not in executable format: file format not recognized. Is there a way to do this? For example, by using **Xvfb**? TIA!