diff --git a/src/nf_modules/ucsc/main.nf b/src/nf_modules/ucsc/main.nf
index 6eeefa835baf2a67726b1718c88d63615be7abc1..369a00d608f2a95ff98521febd1f9861e5769d24 100644
--- a/src/nf_modules/ucsc/main.nf
+++ b/src/nf_modules/ucsc/main.nf
@@ -155,6 +155,7 @@ process wig_to_bigwig_sub {
 
   input:
   tuple val(file_id), path(w)
+  tuple val(idx_id), path(fasta_idx)
 
   output:
   tuple val(file_id), path("${w.simpleName}.bw"), emit: bw