diff --git a/calorimeters/simple_checking.cxx b/calorimeters/simple_checking.cxx
index 9f19b38fd1339d2f702d62e9964065cec717c923..7afeb8a9c791d26495295e9cfe5944c398115cb6 100644
--- a/calorimeters/simple_checking.cxx
+++ b/calorimeters/simple_checking.cxx
@@ -29,7 +29,7 @@ R__LOAD_LIBRARY(libDDG4IO.so)
 //#include "lcio2/TrackerRawDataData.h"
 //#include "lcio2/TrackerRawData.h"
 
-void simple_checking(const char* fname = "./sim_output/output_zdc_photons.root"){
+void simple_checking(const char* fname = "sim_output/output_zdc_photons.root"){
 std::cout << "testing 1\n";
   ROOT::EnableImplicitMT(); // Tell ROOT you want to go parallel
   //using namespace lcio2;