diff --git a/src/main/java/com/datapipe/jenkins/vault/credentials/AbstractVaultTokenCredentialWithExpiration.java b/src/main/java/com/datapipe/jenkins/vault/credentials/AbstractVaultTokenCredentialWithExpiration.java
index 2ff289f3..0cf695fe 100644
--- a/src/main/java/com/datapipe/jenkins/vault/credentials/AbstractVaultTokenCredentialWithExpiration.java
+++ b/src/main/java/com/datapipe/jenkins/vault/credentials/AbstractVaultTokenCredentialWithExpiration.java
@@ -44,8 +44,8 @@ public void setUsePolicies(Boolean usePolicies) {
         this.usePolicies = usePolicies;
     }
 
-    private Map<String, Calendar> tokenExpiry;
-    private Map<String, String> tokenCache;
+    private transient Map<String, Calendar> tokenExpiry;
+    private transient Map<String, String> tokenCache;
 
     protected AbstractVaultTokenCredentialWithExpiration(CredentialsScope scope, String id,
         String description) {