diff --git a/src/nf_modules/macs2/main.nf b/src/nf_modules/macs2/main.nf
index 6570b0b960ec36948c52c1d8d6b16ccf9f8fd915..0996cb134ea4786a4fc001249f64d9eb5b019e5a 100644
--- a/src/nf_modules/macs2/main.nf
+++ b/src/nf_modules/macs2/main.nf
@@ -46,9 +46,9 @@ process peak_calling_bg {
     tuple val(file_id), path(bg_ip), path(bg_control)
 
   output:
-    tuple val(file_id), path "*.narrowPeak", emit: peak
-    tuple val(file_id), path "*.bed", emit: summits
-    tuple val(file_id), path "*_report.txt", emit: report
+    tuple val(file_id), path("*.narrowPeak"), emit: peak
+    tuple val(file_id), path("*.bed"), emit: summits
+    tuple val(file_id), path("*_report.txt"), emit: report
 
   script:
 /* remove --nomodel option for real dataset */