diff --git a/src/requests/mod.rs b/src/requests/mod.rs
index 4369c9c..04ad6a9 100644
--- a/src/requests/mod.rs
+++ b/src/requests/mod.rs
@@ -34,6 +34,8 @@ pub enum ProviderID {
     Pkcs11 = 2,
     /// Provider using a TSS 2.0 Enhanced System API library.
     Tpm = 3,
+    /// Provider using the crypto Trusted Service running in TrustZone
+    TrustedService = 4,
 }
 
 impl std::fmt::Display for ProviderID {