diff --git a/pyproject.toml b/pyproject.toml
index dc9884a9b..74149e24d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,6 @@
 [build-system]
 requires = ["setuptools>=61.0.0"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "python-docx"