Descriptions of Uyghur phonology are unclear as to whether or not the front and back consonant assimilation of velar and uvular stops is a harmonic process (Comrie 1997; De Jong 2007; Engesæth et al. 2010; Friedrich 2002; Hahn 1991, 1998). Data from Uyghur reference materials demonstrate front and back consonant assimilation processes in Uyghur which differ from cross-linguistic consonant harmony as it has been defined and described in the literature (Hansson 2001; Rose and Walker 2004). The data demonstrate that Uyghur consonant assimilation is triggered by vowel harmony, thus it should not be referred to as consonant harmony in future descriptions of Uyghur.