diff --git a/tonic/Cargo.toml b/tonic/Cargo.toml
index 70932dfad..8063764e7 100644
--- a/tonic/Cargo.toml
+++ b/tonic/Cargo.toml
@@ -27,7 +27,7 @@ codegen = ["dep:async-trait"]
 gzip = ["dep:flate2"]
 default = ["transport", "codegen", "prost"]
 prost = ["dep:prost"]
-tls = ["dep:rustls-pemfile", "transport", "dep:tokio-rustls", "tokio/rt", "tokio/macros"]
+tls = ["dep:rustls-pemfile", "transport", "dep:tokio-rustls", "dep:rustls", "tokio/rt", "tokio/macros"]
 tls-roots = ["tls-roots-common", "dep:rustls-native-certs"]
 tls-roots-common = ["tls"]
 tls-webpki-roots = ["tls-roots-common", "dep:webpki-roots"]
@@ -80,6 +80,7 @@ async-stream = { version = "0.3", optional = true }
 rustls-pemfile = { version = "1.0", optional = true }
 rustls-native-certs = { version = "0.6.3", optional = true }
 tokio-rustls = { version = "0.24.1", optional = true }
+rustls = { version = "0.21.7", optional = true }
 webpki-roots = { version = "0.25.0", optional = true }
 
 # compression