diff --git a/java-spring/accounts-query-side-backend/src/main/java/net/chrisrichardson/eventstore/javaexamples/banking/backend/queryside/accounts/AccountInfoUpdateService.java b/java-spring/accounts-query-side-backend/src/main/java/net/chrisrichardson/eventstore/javaexamples/banking/backend/queryside/accounts/AccountInfoUpdateService.java
index 0ff9aaf..e86d57c 100644
--- a/java-spring/accounts-query-side-backend/src/main/java/net/chrisrichardson/eventstore/javaexamples/banking/backend/queryside/accounts/AccountInfoUpdateService.java
+++ b/java-spring/accounts-query-side-backend/src/main/java/net/chrisrichardson/eventstore/javaexamples/banking/backend/queryside/accounts/AccountInfoUpdateService.java
@@ -42,7 +42,7 @@ public class AccountInfoUpdateService {
                       .set("balance", toIntegerRepr(initialBalance))
                       .push("changes", ci)
                       .set("creationDate", new Date(version.getHi()))
-                      .set("version", version),
+                      .set("version", version.asString()),
               AccountInfo.class);
       logger.info("Saved in mongo");