diff --git a/hacking/pr_labeler/pyproject.toml b/hacking/pr_labeler/pyproject.toml
index 54e960789e..aab4cb575f 100644
--- a/hacking/pr_labeler/pyproject.toml
+++ b/hacking/pr_labeler/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = ["setuptools"]
-backend = "setuptools.build_meta"
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "ad-internal-pr-labeler"