diff --git a/pyproject.toml b/pyproject.toml
index 069b00e..91d188e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,3 +28,4 @@ build-backend = "maturin"
 
 [tool.maturin]
 bindings = "cffi"
+features = ["pyo3/extension-module"]