diff --git a/ethers-core/Cargo.toml b/ethers-core/Cargo.toml
index 66919fec..10e2f09a 100644
--- a/ethers-core/Cargo.toml
+++ b/ethers-core/Cargo.toml
@@ -33,7 +33,7 @@ hex = { version = "0.4.3", default-features = false, features = ["std"] }
 
 # async
 tokio = { version = "1.5", default-features = false, optional = true}
-futures-util = { version = "0.3.16", default-features = false, optional = true}
+futures-util = { version = "0.3.16", default-features = false, optional = true, features = ["async-await-macro"]}
 
 [dev-dependencies]
 ethers = { version = "0.4.0", path = "../ethers" }