diff --git a/Cargo.toml b/Cargo.toml
index 8d12c61..b34b032 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,11 @@ license = "Apache-2.0"
 
 [lib]
 name = "unit_converter"
-crate-type = ["cdylib"]
+crate-type = ["cdylib", "rlib"]
 
-[dependencies]
-pyo3 = { version = "0.8", features = ["extension-module"] }
+[dependencies.pyo3]
+version = "0.8"
+
+[features]
+extension-module = ["pyo3/extension-module"]
+default = ["extension-module"]
diff --git a/README.md b/README.md
index 93ff293..fbbf2ac 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,8 @@ Insure the following dependencies are in place:
 1. Build the rust crate first: `cargo build`
 1. Install dependencies and run in a virtualenv: `pipenv install && pipenv shell`
 1. Create the Python package with: `maturin build`
-1. Run the tests: `pytest test.py`
+1. Run the Python tests: `pytest test.py batch_test.py`
+1. Run the Rust test: `cargo test --no-default-features`
 
 ## Documentation
 
diff --git a/src/lib.rs b/src/lib.rs
index 30e9d19..22516b8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -63,6 +63,6 @@ mod tests {
     #[test]
     fn windchill_test() {
         let temperature = Temperature{ celsius: -20.0 };
-        assert_eq!(temperature.windchill(32.0).round(), -32.9);
+        assert_eq!(temperature.windchill(32.0).round(), -33.0);
     }
 }