diff --git a/FullSimLight/src/MyDetectorConstruction.cc b/FullSimLight/src/MyDetectorConstruction.cc
index c03c06f75b8be8858fb71dce73ae4a7c563ca85b..c77ac32fd1b840fdf3abb12f443db6b4f9278900 100644
--- a/FullSimLight/src/MyDetectorConstruction.cc
+++ b/FullSimLight/src/MyDetectorConstruction.cc
@@ -894,7 +894,7 @@ void MyDetectorConstruction::ConstructSDandField()
 #ifdef G4ATLAS
           std::string m_integratorStepper = "AtlasRK4";
 #else
-          std::string m_integratorStepper = "DormandPrinceRK56";
+          std::string m_integratorStepper = "DormandPrince745";
           //or "ClassicalRK4"
 #endif
           std::cout<<"G4VERSION_NUMBER: "<<G4VERSION_NUMBER<<std::endl;