diff --git a/variant_to_realignment.nf b/variant_to_realignment.nf
index a099336..0017ceb 100755
--- a/variant_to_realignment.nf
+++ b/variant_to_realignment.nf
@@ -359,7 +359,7 @@ workflow process_split_reads {
     main:
         flank_length = 50
         filter_align_with_secondary = true
-        chunk_size = 2
+        chunk_size = 5000000
         process_split_reads_generic(
             source_vcf, old_genome_fa, old_genome_fa_fai, old_genome_chrom_sizes,
             new_genome_fa, new_genome_fa_fai, flank_length, filter_align_with_secondary,