[en] Neptunium 237 is a long lived (2 My) radioactive isotope, which belongs to the transuranium actinides. It is one of the most generated nuclear waste produced in nuclear power stations and a candidate for incineration to reduce on the long term the radiotoxicity of the final disposal. The incineration is possible in fast neutron reactors because of the high fission cross section at high energy, beyond the fission threshold. This requires a good knowledge of its cross section and this triggered several measurements in the last decade. We carried out a fission cross section measurement at the n TOF neutron facility at CERN, spanning a very broad energy range, from a fraction of eV to GeV. Our setup was made of 9 targets, including 4 Np237 samples with 1 U235 and 1 U238 targets as references, and the fission fragments were detected in coincidence with parallel plate avalanche counters (PPACs). When compared to previous measurements it appears that our fission cross section is higher by 5-7% beyond the first fission threshold. I will show however that several previous measurements, although consistent with each other, are dependent through re-normalization procedures. To check the relevance of our data we simulated an experiment, performed at Los Alamos, where a sphere of Np237 of 6 kg is surrounded by enriched Uranium 235 so as to reach criticality with fast neutrons. When introducing our data for the fission cross section of Np237 the simulation gives a better agreement with the experiment as the deviation of 750 pcm is reduced to 250 pcm. We explored also the hypothesis of an inaccurate inelastic cross section for U235 which has been invoked by some authors to explain the deviation of 750 pcm, and I will show that large distortions should be applied to reconcile the critical experiment with its simulation. In conclusion these outcomes support the hypothesis of a higher fission cross section of Np237