|Abstract:||In Russian, the phonological diagnostics for prosodic words conflict when applied to compounds. On the one hand, compounds can have multiple stresses (oboròn-o-sposóbnost' `defense-linker-capability'), whereas single-root words can only have a single stress. On the other hand, non-stress rules such as word-final devoicing and vowel reduction treat compounds as single prosodic words. Based on this and other kinds of evidence, I demonstrate that compounds are indeed single prosodic words, though they are required to have a stress for each sub-stem. Secondary stress patterns in compounds also provide some clues as to the location of default stress in what is an almost entirely lexical stress system.