diff --git a/workflow/scripts/bdbagFetch.sh b/workflow/scripts/bdbagFetch.sh
index 15bc977c740ea90c1dbe85c8cb9f1b8eeb4ab70a..08ffcf1220aca10227726f981756855bef2eb649 100644
--- a/workflow/scripts/bdbagFetch.sh
+++ b/workflow/scripts/bdbagFetch.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-if [ ! -z ${3}} ]
+if [ -z ${3}} ]
 then
 bdbag --resolve-fetch all --fetch-filter filename\$*fastq.gz ${1}
     for i in $(find */ -name "*.R*.fastq.gz")