diff --git a/src/nf_modules/danpos/main.nf b/src/nf_modules/danpos/main.nf
index 68d9b687c836d657c9ad05d18e80adbffc7eaf38..5088e93c15490bd9676476068ddb2664045dafcb 100644
--- a/src/nf_modules/danpos/main.nf
+++ b/src/nf_modules/danpos/main.nf
@@ -64,7 +64,7 @@ process dpos_bam {
 """
 danpos.py dpos -m ${m} \
   ${params.dpos} \
-  -b ${bam_wce}
+  -b ${bam_wce} \
   -o ${file_prefix} \
   ${bam_ip}
 mv ${file_prefix}/pooled/* ${file_prefix}/