diff --git a/workflow/main.nf b/workflow/main.nf
index 05da69cec348150a9160d49e9a8db25235294d43..90763c5aa18db0c0417bcc83c6002c11b5b15946 100644
--- a/workflow/main.nf
+++ b/workflow/main.nf
@@ -83,7 +83,7 @@ process trimReads {
   output:
 
   set sampleId, file('*.fq.gz'), biosample, factor, treatment, replicate, controlId into trimmedReads
-  file '*trimming_report.txt' into trimgalore_results
+  file('*trimming_report.txt') into trimgalore_results
 
   script: