diff --git a/pyproject.toml b/pyproject.toml
index cc616bc54..c52119417 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -218,7 +218,7 @@ python_version = "3.10"
 pretty = true
 disallow_any_generics = true
 disallow_untyped_defs = true
-enable_error_code = "ignore-without-code"
+enable_error_code = [ "ignore-without-code", "truthy-bool" ]
 extra_checks = true
 follow_imports = "silent"
 warn_redundant_casts = true