diff --git a/src/main/java/com/avaje/ebeaninternal/server/persist/BatchedBeanHolder.java b/src/main/java/com/avaje/ebeaninternal/server/persist/BatchedBeanHolder.java
index f997b0731..28b5e21a9 100644
--- a/src/main/java/com/avaje/ebeaninternal/server/persist/BatchedBeanHolder.java
+++ b/src/main/java/com/avaje/ebeaninternal/server/persist/BatchedBeanHolder.java
@@ -2,6 +2,7 @@ package com.avaje.ebeaninternal.server.persist;
 
 import java.util.ArrayList;
 import java.util.HashSet;
+import java.util.IdentityHashMap;
 
 import com.avaje.ebeaninternal.server.core.PersistRequest;
 import com.avaje.ebeaninternal.server.core.PersistRequestBean;
@@ -21,6 +22,8 @@ import com.avaje.ebeaninternal.server.deploy.BeanDescriptor;
  */
 public class BatchedBeanHolder {
 
+  private static final Object DUMMY = new Object();
+
   /**
    * The owning queue.
    */
@@ -48,7 +51,11 @@ public class BatchedBeanHolder {
    */
   private ArrayList<PersistRequest> deletes;
 
-  private HashSet<Integer> beanHashCodes = new HashSet<Integer>();
+  /**
+   * Set of beans in this batch. This is used to ensure that a single bean instance is not included
+   * in the batch twice (two separate insert requests etc).
+   */
+  private IdentityHashMap<Object,Object> persistedBeans = new IdentityHashMap<Object,Object>();
 
   /**
    * Create a new entry with a given type and depth.
@@ -90,7 +97,7 @@ public class BatchedBeanHolder {
       control.executeNow(deletes);
       deletes.clear();
     }
-    beanHashCodes.clear();
+    persistedBeans.clear();
   }
 
   public String toString() {
@@ -113,8 +120,8 @@ public class BatchedBeanHolder {
    */
   public int append(PersistRequestBean<?> request) {
 
-    Integer objHashCode = new Integer(System.identityHashCode(request.getEntityBean()));
-    if (!beanHashCodes.add(objHashCode)) {
+    Object alreadyInBatch = persistedBeans.put(request.getEntityBean(), DUMMY);
+    if (alreadyInBatch != null) {
       // special case where the same bean instance has already been
       // added to the batch (doesn't really occur with non-batching
       // as the bean gets changed from dirty to loaded earlier)
@@ -154,6 +161,6 @@ public class BatchedBeanHolder {
    * Return true if this is empty containing no batched beans.
    */
   public boolean isEmpty() {
-    return beanHashCodes.isEmpty();
+    return persistedBeans.isEmpty();
   }
 }
diff --git a/src/test/java/com/avaje/ebeaninternal/server/persist/BatchedBeanHolderTest.java b/src/test/java/com/avaje/ebeaninternal/server/persist/BatchedBeanHolderTest.java
new file mode 100644
index 000000000..c727ac1e0
--- /dev/null
+++ b/src/test/java/com/avaje/ebeaninternal/server/persist/BatchedBeanHolderTest.java
@@ -0,0 +1,42 @@
+package com.avaje.ebeaninternal.server.persist;
+
+import com.avaje.ebean.Ebean;
+import com.avaje.ebeaninternal.api.SpiEbeanServer;
+import com.avaje.ebeaninternal.api.TDSpiEbeanServer;
+import com.avaje.ebeaninternal.server.core.PersistRequest;
+import com.avaje.ebeaninternal.server.core.PersistRequestBean;
+import com.avaje.ebeaninternal.server.deploy.BeanDescriptor;
+import com.avaje.ebeaninternal.server.deploy.BeanManager;
+import com.avaje.tests.model.basic.Customer;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import static org.junit.Assert.assertEquals;
+
+public class BatchedBeanHolderTest {
+
+  @Test
+  public void testAppend() throws Exception {
+
+
+    TDSpiEbeanServer server = new TDSpiEbeanServer("foo");
+
+    BeanDescriptor beanDescriptor = Mockito.mock(BeanDescriptor.class);
+    BeanManager beanManager = new BeanManager(beanDescriptor, null);
+
+
+    BatchedBeanHolder holder = new BatchedBeanHolder(null, beanDescriptor, 1);
+
+    Customer customer = new Customer();
+    PersistRequestBean req1 = new PersistRequestBean(server, customer, null, beanManager, null, null, PersistRequest.Type.INSERT, false);
+
+
+    int size = holder.append(req1);
+    assertEquals(1, size);
+
+    PersistRequestBean req2 = new PersistRequestBean(server, customer, null, beanManager, null, null, PersistRequest.Type.INSERT, false);
+    size = holder.append(req2);
+    assertEquals(0, size);
+
+  }
+}
\ No newline at end of file