diff --git a/Cargo.toml b/Cargo.toml
index fbd7566..664b898 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,6 +22,7 @@ reqwest = ["oauth2/reqwest"]
 ureq = ["oauth2/ureq"]
 native-tls = ["oauth2/native-tls"]
 rustls-tls = ["oauth2/rustls-tls"]
+timing-resistant-secret-traits = ["oauth2/timing-resistant-secret-traits"]
 accept-rfc3339-timestamps = []
 accept-string-booleans = []
 nightly = []