diff --git a/tests/unit/test_helper.bash b/tests/unit/test_helper.bash
index cea9a1912..9b4152bab 100644
--- a/tests/unit/test_helper.bash
+++ b/tests/unit/test_helper.bash
@@ -299,7 +299,7 @@ assert_url() {
 }
 
 assert_urls() {
-  urls=$@
+  urls=( $@ )
   run /bin/bash -c "dokku urls $TEST_APP"
   echo "output: $output"
   echo "status: $status"