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Using the semi-analytic models based on the Millennium simulation, we trace back the evolution of the luminosity function of galaxies residing in progenitors of groups classified by the magnitude gap at redshift zero. We determine the luminosity function of galaxies within 0.25R_200, 0.5R_200 , and R_200 for galaxy groups/clusters. The bright end of the galaxy luminosity function of fossil groups shows a significant evolution with redshift, with changes in M^* by ∼ 1-2 mag between z∼0.5 and z=0doi:10.1051/0004-6361/201424075 fatcat:ksgtbckchrh6tpyiiowlkkjgly