In this paper, we numerically investigate a highly compact 4 mm-long suspended-core silicon-germanium (Si6Ge4) waveguide with air cladding for broadband mid-infrared supercontinuum (SC) generation, which is considerably shorter than those reported in previous studies. The waveguide is carefully engineered to exploit a wide anomalous dispersion regime. Simulations show that pumping at 2.8μ m with a 50 fs sech pulse of 2 kW peak power produces SC spanning 1.559.95μ m. This ultra-broadband output demonstrates the strong potential of Si6Ge4 suspended-core platforms for compact integrated MIR photonics.