diff --git a/Cargo.toml b/Cargo.toml
index 19baf99..48434cc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ base64 = { version = "0.12", optional = true }
 hostname = { version = "0.3", optional = true }
 hyperx = { version = "1", optional = true, features = ["headers"] }
 idna = "0.2"
-tracing = { version = "0.1.16", optional = true }
+tracing = { version = "0.1.16", default-features = false, features = ["std"], optional = true }
 mime = { version = "0.3", optional = true }
 native-tls = { version = "0.2", optional = true }
 nom = { version = "5", optional = true }