diff --git a/modules/local/hicpro/bowtie2_merge.nf b/modules/local/hicpro/bowtie2_merge.nf
index 752966dc91b7d95b4f67747a2052e32d3629baee..ed200d6a3eee66eccce53a0e1f15dc04eacdc2c9 100644
--- a/modules/local/hicpro/bowtie2_merge.nf
+++ b/modules/local/hicpro/bowtie2_merge.nf
@@ -24,7 +24,7 @@ process MERGE_BOWTIE2{
         ${bam1} ${bam2}
 
     samtools sort -@ ${task.cpus} -m 800M \\
-        -n  \\
+        -n \\
         -o ${prefix}_bwt2merged.sorted.bam \\
         ${prefix}_bwt2merged.bam