diff --git a/main.nf b/main.nf
index 13e7ddc..5118bef 100644
--- a/main.nf
+++ b/main.nf
@@ -15,7 +15,7 @@ process split {
 
     script:
     """
-    printf '${x}' | split -b 6 chunk_
+    printf '${x}' | split -b 6 - chunk_
     """
 }