diff --git a/src/jose.rs b/src/jose.rs
index 5ba8ae3..a6ca29c 100644
--- a/src/jose.rs
+++ b/src/jose.rs
@@ -7,7 +7,7 @@ use josekit::jwk::Jwk;
 use rust_util::XResult;
 use serde_json::Value;
 
-const LOCAL_KMS_PREFIX: &'static str = "LOCAL_KMS:";
+const LOCAL_KMS_PREFIX: &'static str = "LKMS:";
 
 pub fn generate_rsa_key(bits: u32) -> XResult<RsaKeyPair> {
     Ok(RsaKeyPair::generate(bits)?)