diff --git a/Cargo.toml b/Cargo.toml
index 73966cd..80126d5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,7 +30,7 @@ tokio = { version = "1.0", features = ["io-std", "macros", "net", "rt-multi-thre
 
 [features]
 default = ["native-tokio", "http1", "tls12", "logging", "acceptor", "ring"]
-acceptor = ["hyper/server", "tokio-runtime"]
+acceptor = ["hyper/server", "ring", "tokio-runtime"]
 http1 = ["hyper/http1"]
 http2 = ["hyper/http2"]
 webpki-tokio = ["tokio-runtime", "webpki-roots"]