diff --git a/tests/unit/40_core_2.bats b/tests/unit/40_core_2.bats
index 03bbee8ec..561901491 100644
--- a/tests/unit/40_core_2.bats
+++ b/tests/unit/40_core_2.bats
@@ -41,7 +41,7 @@ build_nginx_config() {
   echo "output: "$output
   echo "status: "$status
   assert_failure
-  run /bin/bash -c "dokku fakecommand | grep -q 'is not a dokku command'"
+  run /bin/bash -c "dokku fakecommand 2>&1 | grep -q 'is not a dokku command'"
   echo "output: "$output
   echo "status: "$status
   assert_success