diff --git a/pyproject.toml b/pyproject.toml
index 6542389..bcf68df 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -122,7 +122,7 @@ test = [
 [tool.ruff]
 target-version = "py38"  # minimum supported version
 line-length = 88  # same as Black.
-exclude = [
+extend-exclude = [
     "screenpy/__init__.py",
     "screenpy/__version__.py",
     "docs",