diff --git a/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java b/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
index 8c3f2a8c..39eaf46c 100755
--- a/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
+++ b/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
@@ -353,6 +353,9 @@ public class MemoryMessagesStore implements IMessagesStore {
 
                         size += bundle.getMessage().getSerializedSize();
                         if (size >= 512 * 1024) { //3M
+                            if(builder.getMessageCount() == 0){
+                                builder.addMessage(bundle.getMessage());
+                            }
                             break;
                         }
                         builder.addMessage(bundle.getMessage());
@@ -1996,7 +1999,7 @@ public class MemoryMessagesStore implements IMessagesStore {
         } else {
             state = 0;
         }
-        
+
         HazelcastInstance hzInstance = m_Server.getHazelcastInstance();
         MultiMap<String, FriendData> friendsMap = hzInstance.getMultiMap(USER_FRIENDS);
 
@@ -2642,7 +2645,7 @@ public class MemoryMessagesStore implements IMessagesStore {
         }
         return UUIDGenerator.getUUID();
     }
-    
+
     @Override
     public void storeRetained(Topic topic, StoredMessage storedMessage) {
         LOG.debug("Store retained message for topic={}, CId={}", topic, storedMessage.getClientID());