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The quality and the performance of hybrid perovskite (HP)’s films strongly depend on the complete conversion into MAPbI₃ of a spin-coated solution of methylammonium iodide (MAI) and PbI₂. Highly crystalline PbI₂ on a substrate limits such a conversion and, consequently, the HP’s solar cell performances. We investigate for the first time the use of short-chain organic acids as additives in a non-complexing solvent like γ-butyrolactone (GBL), that can retard retard the crystallization of PbI₂. Based on XRD analyses of the spin coated films, the acetic acid is the most effective additive in retarding the PbI₂ crystallization, making Pb²⁺ available for a subsequent reaction with MAI. These results open a new experimental path for fabricating perovskite films by single or sequential step methods involving acid additives.