diff --git a/conf/templates/pyproject.toml b/conf/templates/pyproject.toml
index 0cd002f4..c5adcb21 100644
--- a/conf/templates/pyproject.toml
+++ b/conf/templates/pyproject.toml
@@ -16,6 +16,8 @@
 
   warn_return_any = true
 
+  disallow_incomplete_defs = true
+
   enable_error_code = [
     "explicit-override",
     "ignore-without-code",