diff --git a/TShockAPI/DB/GroupManager.cs b/TShockAPI/DB/GroupManager.cs
index 70e444d2..1fd408a3 100644
--- a/TShockAPI/DB/GroupManager.cs
+++ b/TShockAPI/DB/GroupManager.cs
@@ -154,8 +154,10 @@ namespace TShockAPI.DB
             permissions.AddRange(group.permissions.Where(s => !permissions.Contains(s)));
 
             if (database.Query("UPDATE GroupList SET Commands=@0 WHERE GroupName=@1", String.Join(",", permissions), name) != 0)
+            {
                 message = "Group " + name + " has been modified successfully.";
-
+                group.SetPermission( permissions );
+            }
             return message;
         }
 
@@ -168,11 +170,13 @@ namespace TShockAPI.DB
             var group = Tools.GetGroup(name);
 
             //Only get permissions that exist in the group.
-            var newperms = permissions.Where(s => group.permissions.Contains(s));
+            var newperms = group.permissions.Except( permissions );
 
             if (database.Query("UPDATE GroupList SET Commands=@0 WHERE GroupName=@1", String.Join(",", newperms), name) != 0)
+            {
                 message = "Group " + name + " has been modified successfully.";
-
+                group.SetPermission( newperms.ToList() );
+            }
             return message;
         }
 
diff --git a/TShockAPI/Group.cs b/TShockAPI/Group.cs
index a7fbddb3..c089ff16 100644
--- a/TShockAPI/Group.cs
+++ b/TShockAPI/Group.cs
@@ -73,6 +73,14 @@ namespace TShockAPI
         {
             permissions.Add(permission);
         }
+        public void SetPermission( List<string> permission)
+        {
+            permissions.Clear();
+            foreach( string s in permission )
+            {
+                permissions.Add( s );
+            }
+        }
     }
 
     public class SuperAdminGroup : Group