diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/repository/dao/MapJobInstanceDao.java b/spring-batch-core/src/main/java/org/springframework/batch/core/repository/dao/MapJobInstanceDao.java
index caefdb528..beb0f7dd9 100644
--- a/spring-batch-core/src/main/java/org/springframework/batch/core/repository/dao/MapJobInstanceDao.java
+++ b/spring-batch-core/src/main/java/org/springframework/batch/core/repository/dao/MapJobInstanceDao.java
@@ -19,7 +19,7 @@ public class MapJobInstanceDao implements JobInstanceDao {
 
 	private static Collection<JobInstance> jobInstances = TransactionAwareProxyFactory.createTransactionalList();
 
-	private long currentId = 0;
+	private static long currentId = 0;
 
 	public static void clear() {
 		jobInstances.clear();