diff --git a/MaxMind.Db/InvalidDatabaseException.cs b/MaxMind.Db/InvalidDatabaseException.cs
index 5de2709..842b126 100644
--- a/MaxMind.Db/InvalidDatabaseException.cs
+++ b/MaxMind.Db/InvalidDatabaseException.cs
@@ -9,6 +9,7 @@ namespace MaxMind.Db
     /// <summary>
     ///     Thrown when the MaxMind database file is incorrectly formatted
     /// </summary>
+    [Serializable]
     public class InvalidDatabaseException : ApplicationException
     {
         /// <summary>