diff --git a/modules/local/pivot/wider/main.nf b/modules/local/pivot/wider/main.nf
index 3b2a7333..62b0e9e3 100644
--- a/modules/local/pivot/wider/main.nf
+++ b/modules/local/pivot/wider/main.nf
@@ -20,7 +20,7 @@ process PIVOT_WIDER {
         --input final_long_results_temp.csv \\
         --output ${meta.id}_concatenated_temp.csv
 
-    sort -t\$'\t' -k1,1 ${meta.id}_concatenated_temp.csv > joined_samples_mirtop.csv
+    sort -t\$'\t' -k1,1 ${meta.id}_concatenated_temp.csv > joined_samples_mirtop.tsv
 
     cat <<-END_VERSIONS > versions.yml
     "${task.process}":