diff --git a/src/nf_modules/star/main_2.7.8a.nf b/src/nf_modules/star/main_2.7.8a.nf
index 7ee0ac3db8e073651e290d11f4ae4c751140dbb2..e7be9f7edb1b5673422089dc1c936368a2cc187e 100644
--- a/src/nf_modules/star/main_2.7.8a.nf
+++ b/src/nf_modules/star/main_2.7.8a.nf
@@ -194,7 +194,7 @@ process mapping_withindex {
   }
 
   input:
-    path(index)
+    val(index)
     tuple val(reads_id), path(reads) 
 
   output: