diff --git a/bilby/gw/likelihood/relative.py b/bilby/gw/likelihood/relative.py
index 4cab054f..06927b46 100644
--- a/bilby/gw/likelihood/relative.py
+++ b/bilby/gw/likelihood/relative.py
@@ -320,7 +320,7 @@ def compute_summary_data(self):
             # For the last bin, make sure to include
             # the last point in the frequency array
             # if it is not already included
-            if masked_bin_inds[-1] != (len(masked_frequency_array) - 1):
+            if masked_bin_inds[-1] < (len(masked_frequency_array) - 1):
                 masked_bin_inds[-1] += 1
 
             masked_strain = interferometer.frequency_domain_strain[mask]