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[u/mrichter/AliRoot.git] / TRD / AliTRDmcmSim.cxx

diff --git a/TRD/AliTRDmcmSim.cxx b/TRD/AliTRDmcmSim.cxx
index df54db993d51863c3234e73e5a6038b238f5d000..e6cbfc1830834124382af135d7ec27bef424e9b5 100644 (file)
--- a/TRD/AliTRDmcmSim.cxx
+++ b/TRD/AliTRDmcmSim.cxx
@@ -1569,7 +1569,7 @@ void AliTRDmcmSim::FitTracklet()
       nHits   = fit0->fNhits + fit1->fNhits; // number of hits
       sumX    = fit0->fSumX  + fit1->fSumX;
       sumX2   = fit0->fSumX2 + fit1->fSumX2;
-      denom   = nHits * sumX2 - sumX * sumX;
+      denom   = ((Long64_t) nHits)*((Long64_t) sumX2) - ((Long64_t) sumX)*((Long64_t) sumX);
 
       mult    = mult / denom; // exactly like in the TRAP program
       q0      = fit0->fQ0    + fit1->fQ0;