diff --git a/IRCpkg/NewtonMethod/AlgoMerged.py b/IRCpkg/NewtonMethod/AlgoMerged.py
index c99e3a2be12cd80587d87c4a9622f665441a0df4..9713bd72de3c0877fbeecd6e32110467d3f3ca21 100644
--- a/IRCpkg/NewtonMethod/AlgoMerged.py
+++ b/IRCpkg/NewtonMethod/AlgoMerged.py
@@ -29,7 +29,7 @@ def estimate_equil_correlation(timeline, dt, n_points_equil=500, folder="./", ti
     if (len(timeline)- t0 +1) < 32:
         autocorr_index = -32
 
-    tmp_autocorr_arr = autocorrelate(effective_timeline[autocorr_index:], normalize=True)
+    tmp_autocorr_arr = autocorrelate(timeline[autocorr_index:], normalize=True)
     lag_times = tmp_autocorr_arr[:,0]
     autocorr_vals = tmp_autocorr_arr[:,1]