diff --git a/im-center-server/src/main/java/cn/axzo/im/group/GroupSupport.java b/im-center-server/src/main/java/cn/axzo/im/group/GroupSupport.java
index 7570f67..39b9592 100644
--- a/im-center-server/src/main/java/cn/axzo/im/group/GroupSupport.java
+++ b/im-center-server/src/main/java/cn/axzo/im/group/GroupSupport.java
@@ -41,7 +41,7 @@ public class GroupSupport {
         group.setMemberCount((long) request.getPeople().size());
         Long memberLimit = request.getMemberLimit();
         if (memberLimit == null)
-            memberLimit = (long) groupProps.getDefaultMemberLimit();
+            memberLimit = groupProps.getDefaultMemberLimit();
         group.setMemberLimit(memberLimit);
         group.setOwnerAccount(owner);
         group.setOwnerPersonId(request.getOwner().personIdAsLong());
diff --git a/im-center-server/src/main/java/cn/axzo/im/group/support/GroupProps.java b/im-center-server/src/main/java/cn/axzo/im/group/support/GroupProps.java
index c629224..eee64c2 100644
--- a/im-center-server/src/main/java/cn/axzo/im/group/support/GroupProps.java
+++ b/im-center-server/src/main/java/cn/axzo/im/group/support/GroupProps.java
@@ -17,7 +17,7 @@ import org.springframework.context.annotation.Configuration;
 @ConfigurationProperties(prefix = "im-group")
 public class GroupProps {
 
-    private int defaultMemberLimit = 499;
+    private long defaultMemberLimit = 499;
 
     private int syncMessageTps = 20;
     private int createGroupTps = 10;