diff --git a/core/src/main/java/org/keycloak/jose/jws/JWSHeader.java b/core/src/main/java/org/keycloak/jose/jws/JWSHeader.java
index e1bbd99..81d51e7 100755
--- a/core/src/main/java/org/keycloak/jose/jws/JWSHeader.java
+++ b/core/src/main/java/org/keycloak/jose/jws/JWSHeader.java
@@ -1,5 +1,6 @@
package org.keycloak.jose.jws;
+import org.codehaus.jackson.annotate.JsonIgnoreProperties;
import org.codehaus.jackson.annotate.JsonProperty;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.annotate.JsonSerialize;
@@ -11,6 +12,7 @@ import java.io.Serializable;
* @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
* @version $Revision: 1 $
*/
+@JsonIgnoreProperties(ignoreUnknown = true)
public class JWSHeader implements Serializable {
@JsonProperty("alg")
private Algorithm algorithm;