diff --git a/workflow/main.nf b/workflow/main.nf
index 676a1a721b0a8a3fcbacd973ee7cf27e4613eac4..de87ca97d3c70fbf77444f84571597018120f230 100644
--- a/workflow/main.nf
+++ b/workflow/main.nf
@@ -57,7 +57,7 @@ readsList = Channel
 
 // Define regular variables
 pairedEnd = params.pairedEnd
-designFile = params.designFile
+designFile = Channel.fromPath(params.designFile)
 genomeSize = params.genomeSize
 genome = params.genome
 chromSizes = params.chromSizes
@@ -78,8 +78,8 @@ process checkDesignFile {
 
   input:
 
-  file designFile
-  file readsList
+  designFile
+  readsList
 
   output: