diff --git a/tests/converters/wise_v0/config.toml b/tests/converters/wise_v0/config.toml
index 26a8af5..45134f9 100644
--- a/tests/converters/wise_v0/config.toml
+++ b/tests/converters/wise_v0/config.toml
@@ -1,6 +1,7 @@
 [beanify]
 default-converter = "wise_v0"
 rule-interface = "json"
+theme = "black"
 
 [rules.json]
 rulepath = "./rules.json"