  The Daya Bay, Double Chooz and RENO experiments recently observed a
significant distortion in their detected reactor antineutrino spectra, being at
odds with the current predictions. Although such a result suggests to revisit
the current reactor antineutrino spectra modeling, an alternative scenario,
which could potentially explain this anomaly, is explored in this letter. Using
an appropriate statistical method, a study of the Daya Bay experiment energy
scale is performed. While still being in agreement with the {\gamma}
calibration data and Boron 12 measured spectrum, it is shown that a O(1%)
deviation of the energy scale reproduces the distortion observed in the Daya
Bay spectrum, remaining within the quoted calibration uncertainties. Potential
origins of such a deviation, which challenge the energy calibration of these
detectors, are finally discussed.
