diff --git a/workflow/main.nf b/workflow/main.nf
index 3e03361a100a977106284f4126e3481c50ba5a76..676a1a721b0a8a3fcbacd973ee7cf27e4613eac4 100644
--- a/workflow/main.nf
+++ b/workflow/main.nf
@@ -78,7 +78,7 @@ process checkDesignFile {
 
   input:
 
-  designFile
+  file designFile
   file readsList
 
   output: