diff --git a/NPLib/Detectors/Actar/TActarPhysics.cxx b/NPLib/Detectors/Actar/TActarPhysics.cxx
index b546ae71c1637020608fa789dc6b32cb1e972c03..da9dbd291b5a7fa090a072a96ab6a1e9fa285dbe 100644
--- a/NPLib/Detectors/Actar/TActarPhysics.cxx
+++ b/NPLib/Detectors/Actar/TActarPhysics.cxx
@@ -642,7 +642,9 @@ void TActarPhysics::ReadAnalysisConfig() {
 
   // Lookup table //
   bool ReadingLookupTable = false;
-  string LT_FileName = "./configs/LT.dat";
+  string LT_FileName; 
+  if(IsSimulation()) {LT_FileName = "./configs/LT_SIMU.dat";}
+  else {LT_FileName = "./configs/LT.dat";}
   ifstream LTConfigFile;
   LTConfigFile.open(LT_FileName.c_str());
   if(!LTConfigFile.is_open()){