diff --git a/resources/auxiliary_workflows/benchmark/workflow/scripts/bed_file_single_amplicon.py b/resources/auxiliary_workflows/benchmark/workflow/scripts/bed_file_single_amplicon.py
index 4e7eefd2..558f025f 100644
--- a/resources/auxiliary_workflows/benchmark/workflow/scripts/bed_file_single_amplicon.py
+++ b/resources/auxiliary_workflows/benchmark/workflow/scripts/bed_file_single_amplicon.py
@@ -10,7 +10,7 @@ def main(fname_reference, fname_insert_bed, genome_size):
         f.write(
             str(seq_id)
             + "  1       "
-            + str(genome_size)
+            + str(genome_size+1)
             + "     scheme_INSERT_1 1       +"
         )