diff --git a/tests/unit/test_helper.bash b/tests/unit/test_helper.bash
index c7d08244d..1db3e29da 100644
--- a/tests/unit/test_helper.bash
+++ b/tests/unit/test_helper.bash
@@ -248,7 +248,7 @@ assert_url() {
 }
 
 assert_urls() {
-  urls=( $@ )
+  urls=$@
   run /bin/bash -c "dokku urls $TEST_APP"
   echo "output: $output"
   echo "status: $status"