diff --git a/include/ActionInitialization.hh b/include/ActionInitialization.hh
index b41800a..5f12f6b 100644
--- a/include/ActionInitialization.hh
+++ b/include/ActionInitialization.hh
@@ -61,9 +61,9 @@ class ActionInitialization : public G4VUserActionInitialization
 
   private:
     B4::DetectorConstruction* fDetConstruction = nullptr;
-    G4double minEnergy;
-    G4double maxEnergy;
-    G4String partSpecies;
+    G4double minEnergy=1000;
+    G4double maxEnergy=1000;
+    G4String partSpecies="e-";
 };
 
 }