diff --git a/pyproject.toml b/pyproject.toml
index df40974cd..cb077b1be 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -405,6 +405,7 @@ plugins = [
 
 [tool.pyrefly]
 errors.non-exhaustive-match = "error"
+errors.unused-ignore = "error"
 
 [tool.pyright]
 typeCheckingMode = "strict"