The high-pressure behavior of dihydroxylammonium 5,5'-bis(3-nitro-1,2,4-triazolate-1 N-oxide) (MAD-X1) was studied at room temperature to 25 GPa by Raman spectroscopy and powder X-ray diffraction. No evidence of polymorphism was observed over this pressure range, indicating that the ambient structure of MAD-X1 remains stable up to conditions similar to the detonation pressure of the material. Additionally, such findings suggest that this high performance material can serve as an insensitive RDX replacement in energetic formulations without the concern of uncontrolled polymorphism that might otherwise affect the performance and safety of the munition.