In accordance with Article 6 of Regulation (EC) No 396/2005, the evaluating Member State (EMS) Hungary received an application from Bayer Crop Science to set a new maximum residue level (MRL) for the active substance prothioconazole in sunflower seeds. Hungary drafted an evaluation report in accordance with Article 8 of Regulation (EC) No 396/2005, which was submitted to the European Commission and forwarded to EFSA. According to EFSA the submitted data are sufficient to derive a MRL proposal of 0.2 mg/kg for prothioconazole on sunflower. Adequate analytical enforcement methods are available. Based on the risk assessment results, EFSA concludes that the proposed use of prothioconazole on sunflower will not result in a consumer exposure exceeding the toxicological reference values and therefore is unlikely to pose a consumer health risk.