diff --git a/tests/unit/test_helper.bash b/tests/unit/test_helper.bash
index b59841339..2614c284d 100644
--- a/tests/unit/test_helper.bash
+++ b/tests/unit/test_helper.bash
@@ -180,7 +180,7 @@ assert_nonssl_domain() {
 
 assert_app_domain() {
   local domain=$1
-  run /bin/bash -c "dokku domains $TEST_APP | grep -xF ${domain}"
+  run /bin/bash -c "dokku domains $TEST_APP 2> /dev/null | grep -xF ${domain}"
   echo "output: $output"
   echo "status: $status"
   assert_output "${domain}"