diff --git a/test/commands/app_test.rb b/test/commands/app_test.rb
index 0c277e2b..53e2d238 100644
--- a/test/commands/app_test.rb
+++ b/test/commands/app_test.rb
@@ -60,7 +60,7 @@ class CommandsAppTest < ActiveSupport::TestCase
   end
 
   test "stop with custom stop wait time" do
-    @config["stop_wait_time"] = 30
+    @config[:stop_wait_time] = 30
     assert_equal \
       "docker ps --quiet --filter label=service=app --filter label=role=web | xargs docker stop -t 30",
       new_command.stop.join(" ")