diff --git a/core/lib/Cargo.toml b/core/lib/Cargo.toml
index 85c91f262f..c9d1f33444 100644
--- a/core/lib/Cargo.toml
+++ b/core/lib/Cargo.toml
@@ -34,7 +34,7 @@ rmp-serde = { version = "0.15.0", optional = true }
 uuid_ = { package = "uuid", version = "0.8", optional = true, features = ["serde"] }
 
 # Non-optional, core dependencies from here on out.
-futures = "0.3.0"
+futures = { version = "0.3.0", default-features = false, features = ["std"] }
 yansi = "0.5"
 log = { version = "0.4", features = ["std"] }
 num_cpus = "1.0"