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In this work we study type IIB Calabi-Yau orientifold compactifications inthe presence of space-time filling D7-branes and O7-planes. In particular, weconclude that $\alpha'^2 g_s$-corrections to their DBI actions lead to amodification of the four-dimensional $\mathcal{N}=1$ K\"ahler potential andcoordinates. We focus on the one-modulus case of the geometric background i.e.$h^{1,1}=1$ where we find that the $\alpha'^2 g_s$-correction is of topologicalnature. It depends on the first Chern form of the four-cycle of the Calabi-Yauorientifold which is wrapped by the D7-branes and O7-plane. This is inagreement with our previous F-theory analysis and provides further evidence fora potential breaking of the no-scale structure at order $\alpha'^2 g_s$.Corrected background solutions for the dilaton, the warp-factor as well as theinternal space metric are derived. Additionally, we briefly discuss$\alpha'$-corrections from other D$p$-branes.

On $\alpha'$-effects from $D$-branes in $4d \; \mathcal{N} = 1$