diff --git a/workflow/main.nf b/workflow/main.nf
index c290055ffcbf9590b1bd446cc772d8b4830e2e14..10f5a98743873fe7660cd4088e34f1abf00507c7 100644
--- a/workflow/main.nf
+++ b/workflow/main.nf
@@ -319,6 +319,7 @@ process poolAndPsuedoReads {
 experimentRows = experimentPoolObjs
                 .collect()
                 .splitCsv(sep:'\t', header: true)
+                .flatten()
                 .map { row -> [ row.sample_id, row.tag_align, row.xcor, row.experiment_id, row.biosample, row.factor, row.treatment, row.replicate, row.control_id, row.control_tag_align] }
 
 // Call Peaks using MACS