[en] The standard model of particle physics is being probed at the LHC collider ring at Geneva. Amongst others, top-quark pairs are produced in large quantities. This makes precision measurements of top-quark properties possible. The top quark as the electroweak-isospin partner of the bottom quark is expected to have an electric charge of +2/3 e. A measurement is presented that discriminates between the top quark charge hypotheses of +2/3 e and -4/3 e using the muon+jets final state of top-pair events t anti t→(bμν)(bqq'). The measurement is performed with proton-proton collisions at √(s)=7 TeV recorded by the CMS detector in the year 2011, corresponding to an integrated luminosity of 5.0 fb^-1. Charge correlations between the high-p_T muons from the hard process and a muon from one of the bottom quarks are exploited to sort the events in a +2/3 e or -4/3 e category. The normalized asymmetry between both categories is calculated. The top quark charge scenario of -4/3 e would correspond to an asymmetry of A=-1. This is excluded with high significance while the measured asymmetry of A=1.10±0.12(stat.)±0.34(sys.) confirms the standard-model expectation of A=+1.