It has become commonplace in historical linguistics to recognize instances in which final consonants have been lost from the ends of words. When inspecting sets of apparent cognates which differ only in that one language has final stops which are missing in the other, few linguists would hesitate to conclude that the stopped items represent the older form. More specifically, among the Tibeto-Burman languages, where some languages have a much fuller complement of final stops than others, it has been generally taken for granted that languages with many final stops are, in that feature, more conservative than languages with few or no final stops. Nevertheless, in the Maru language, which is spoken in northern Burma and which is quite closely related to Burmese, certain final stops seem to be intrusive, though they have developed in an entirely regular way from unstopped syllables. That is, certain Maru syllables which have final stops are cognate with unstopped Burmese syllables, and it will be the purpose of this paper to argue that the open syllable forms of Burmese are the more conservative.