diff --git a/rcgen/examples/simple.rs b/rcgen/examples/simple.rs
index 6cbbd916..fea09381 100644
--- a/rcgen/examples/simple.rs
+++ b/rcgen/examples/simple.rs
@@ -28,7 +28,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 	println!("{}", cert.serialize_private_key_pem());
 	std::fs::create_dir_all("certs/")?;
 	fs::write("certs/cert.pem", pem_serialized.as_bytes())?;
-	fs::write("certs/cert.der", &der_serialized)?;
+	fs::write("certs/cert.der", der_serialized)?;
 	fs::write(
 		"certs/key.pem",
 		&cert.serialize_private_key_pem().as_bytes(),