diff --git a/example-service/Cargo.toml b/example-service/Cargo.toml
index 707d88a..3782574 100644
--- a/example-service/Cargo.toml
+++ b/example-service/Cargo.toml
@@ -17,7 +17,7 @@ clap = "2.0"
 futures = "0.3"
 serde = { version = "1.0" }
 tarpc = { version = "0.18", path = "../tarpc", features = ["full"] }
-tokio = "0.2"
+tokio = { version = "0.2", features = ["full"] }
 tokio-serde = { version = "0.6", features = ["json"] }
 env_logger = "0.6"