diff --git a/src/main/java/org/opensearch/security/http/OnBehalfOfAuthenticator.java b/src/main/java/org/opensearch/security/http/OnBehalfOfAuthenticator.java
index 74a4af3d80..43757c0268 100644
--- a/src/main/java/org/opensearch/security/http/OnBehalfOfAuthenticator.java
+++ b/src/main/java/org/opensearch/security/http/OnBehalfOfAuthenticator.java
@@ -56,8 +56,6 @@ public class OnBehalfOfAuthenticator implements HTTPAuthenticator {
 
     private static final Pattern BEARER = Pattern.compile("^\\s*Bearer\\s.*", Pattern.CASE_INSENSITIVE);
     private static final String BEARER_PREFIX = "bearer ";
-    private static final String TOKEN_TYPE_CLAIM = "typ";
-    private static final String TOKEN_TYPE = "obo";
 
     private final JwtParser jwtParser;
     private final String encryptionKey;