diff --git a/developer/bootstrap-repo.sh b/developer/bootstrap-repo.sh
index bd41e59..0351da7 100755
--- a/developer/bootstrap-repo.sh
+++ b/developer/bootstrap-repo.sh
@@ -73,7 +73,7 @@
   repo sync
 
   # download gerrit patches using repo
-  if [[ ! -z "${GERRIT_PATCHES[*]-}" ]]
+  if [[ -n "${GERRIT_PATCHES[*]-}" ]]
   then
     for gerrit_patch in "${GERRIT_PATCHES[@]-}"
     do