diff --git a/trackers/roman_pot_hit_eta.cxx b/trackers/roman_pot_hit_eta.cxx
index bd64992d899ccf6f02991969bf36897eb916bec5..ebe3b06c65f339789ecc6ae7c9151122e6a029fd 100644
--- a/trackers/roman_pot_hit_eta.cxx
+++ b/trackers/roman_pot_hit_eta.cxx
@@ -29,7 +29,7 @@ R__LOAD_LIBRARY(libDDG4IO.so)
 //#include "lcio2/TrackerRawDataData.h"
 //#include "lcio2/TrackerRawData.h"
 
-void roman_pot_hit_eta(const char* fname = "../sim_output/roman_pot_out.root"){
+void roman_pot_hit_eta(const char* fname = "./sim_output/roman_pot_out.root"){
 
   ROOT::EnableImplicitMT(); // Tell ROOT you want to go parallel
   double degree = TMath::Pi()/180.0;