This note presents the results of a search for charged Higgs bosons, $H^{\pm}$, in 1.03 fb$^{-1}$ of proton-proton collision data recorded at $\sqrt{s}=7$ TeV with the ATLAS experiment at the LHC using the $\tau$+jets channel in $t\overline{t}$ decays with a hadronically decaying $\tau$ lepton in the final state. The data agree with the SM expectation leading to a limit on the product of branching ratios BR($t \to bH^{\pm}) \times$ BR($H^\pm \to \tau\nu$) of $0.03-0.10$ for $H^\pm$ masses in the range 90 \GeV. In the context of the MSSM values of $\tan \beta$ larger than $22-30$ are excluded in the mass range 90 \GeV< m_{H^\pm}< 140 \GeV.

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