PVS-Studio warning V624 for Geant4

G4double G4ElasticHadrNucleusHE::
   HadrNucDifferCrSec(G4int Nucleus, G4double aQ2)
{
  ....
  dSigPodT = HadrTot*HadrTot*(1+HadrReIm*HadrReIm)*
               (
                Coeff1*std::exp(-Slope1*SqrQ2)+
                Coeff2*std::exp( Slope2*(ConstU)+aQ2)+
                (1-Coeff1-Coeff0)*std::exp(-HadrSlope*aQ2)+
               +Coeff0*std::exp(-Slope0*aQ2)
                )/16/3.1416*2.568;
  ....
}

This suspicious code was found in Geant4 project by PVS-Studio static code analyzer.
Warning message is:
V624 The constant 3.1416 is being utilized. The resulting value could be inaccurate. Consider using the M_PI constant from <math.h>. g4elastichadrnucleushe.cc 750

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