The invention relates to the use of aminoacetonitrile compounds of formula (I), wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.8, R.sub.9, A, m and n have the significances given in claim 1, in the control of endoparasites, especially helminths, in warm-blooded productie livestock and domestic animals.

 
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