diff --git a/pyproject.toml b/pyproject.toml
index dea575e..d4ffff7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,5 +15,5 @@ black = {version = "^20.8b1", python = "^3.6"}
 mypy = {version = "^0.800", python = "^3.6"}
 
 [build-system]
-requires = ["poetry-core>=1.0.0", "Cython"]
+requires = ["poetry-core>=1.0.0", "Cython", "setuptools"]
 build-backend = "poetry.core.masonry.api"