diff --git a/Cargo.toml b/Cargo.toml
index 6a022f3..d9cf6b1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,8 @@ license = "BSD-2-Clause"
 volatile-register = "0.2"
 aligned = "0.3"
 embedded-hal = "0.2"
-smoltcp = { version = "0.7.0", default-features = false, features = [ "socket-raw", "proto-ipv4", "proto-ipv6" ], optional = true }
+smoltcp = { version = "0.7.0", default-features = false, features = [ "socket-raw", "proto-ipv4",
+    "proto-ipv6", "socket-tcp", "ethernet"], optional = true }
 cortex-m = {version = "0.5", optional = true }
 
 # Optional dependencies for building examples