diff --git a/src/nf_modules/RSEM/rsem.nf b/src/nf_modules/RSEM/rsem.nf
index 54e6ad0cec2305207c274efe6b9187d53439be75..9a14cc8b931e10d0e04765d989d688657c0259fd 100644
--- a/src/nf_modules/RSEM/rsem.nf
+++ b/src/nf_modules/RSEM/rsem.nf
@@ -71,7 +71,7 @@ process mapping_fastq {
 
   input:
   set pair_id, file(reads) from fastq_files
-  file index from index_files.toList()
+  file index from index_files.collect()
 
   output:
   file "*" into counts_files
@@ -120,7 +120,7 @@ process mapping_fastq {
 
   input:
   file reads from fastq_files
-  file index from index_files.toList()
+  file index from index_files.collect()
 
   output:
   file "*" into count_files
diff --git a/src/nf_modules/RSEM/tests/quantification_paired.nf b/src/nf_modules/RSEM/tests/quantification_paired.nf
index 75ae42f49524ac0b251a53700220680f0f8f13b4..0109500908f61159c5426b35c7dcb1a02fb60022 100644
--- a/src/nf_modules/RSEM/tests/quantification_paired.nf
+++ b/src/nf_modules/RSEM/tests/quantification_paired.nf
@@ -20,7 +20,7 @@ process mapping_fastq {
 
   input:
   set pair_id, file(reads) from fastq_files
-  file index from index_files.toList()
+  file index from index_files.collect()
 
   output:
   file "*" into counts_files
diff --git a/src/nf_modules/RSEM/tests/quantification_single.nf b/src/nf_modules/RSEM/tests/quantification_single.nf
index 0fd26f0ce83f1c11f2eea62846fad566beac3e8c..63b2a40c3e846931aa09ea2c03e84677ae8c659f 100644
--- a/src/nf_modules/RSEM/tests/quantification_single.nf
+++ b/src/nf_modules/RSEM/tests/quantification_single.nf
@@ -1,6 +1,6 @@
 params.fastq = "$baseDir/data/fastq/*.fastq"
 params.index = "$baseDir/data/index/*.index*"
-params.mean = 300
+params.mean = 125
 params.sd = 100
 
 log.info "fastq files : ${params.fastq}"
@@ -24,7 +24,7 @@ process mapping_fastq {
 
   input:
   file reads from fastq_files
-  file index from index_files.toList()
+  file index from index_files.collect()
 
   output:
   file "*" into count_files