Abstract: The present invention relates to the use of an insect repellent, preferably selected from the group 2-(2-hydroxyethyl)-1-methylpropyl 1-piperidinecarboxylate, N,N-diethyl-3-methylbenzamide, dimethyl phthalate, butopyronoxyl, 2,3,4,5-bis(2-butylene)-tetrahydro-2-furaldehyde, N,N-diethylcaprylamide, N,N-diethylbenzamide, o-chloro-N,N-diethylbenzamide, dimethyl carbate, di-n-propyl isocinchomeronate, 2-ethylhexane-1,3-diol, N-octylbicycloheptenedicarboximide or piperonyl butoxide, particularly preferably 2-(2-hydroxyethyl)-1-methylpropyl 1-piperidinecarboxylate, as action enhancer for a second insect repellent, to corresponding compositions, and to the preparation thereof.