diff --git a/src/inversion_scripts/calc_sensi.py b/src/inversion_scripts/calc_sensi.py
index 9ce28ac5..a9e370a2 100644
--- a/src/inversion_scripts/calc_sensi.py
+++ b/src/inversion_scripts/calc_sensi.py
@@ -135,6 +135,8 @@ def process(h):
                 # Determine which run directory to look in
                 if nruns > 0:
                     run_number = math.trunc((e+1)/ntracers)
+                    if run_number >= nruns:
+                        run_number = nruns-1
                 else:
                     run_number = e + 1
                 run_num = zero_pad_num(run_number)