diff --git a/pyproject.toml b/pyproject.toml
index 7907f26..2e0a8be 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,6 +20,7 @@ octoreservations = "octoprint_reservations.main:main"
 dev = []
 
 [tool.black]
+line-length = 88
 
 [build-system]
 requires = ["pdm-backend"]