diff --git a/src/IKVM.MSBuild.Tasks/IkvmTaskMessageException.cs b/src/IKVM.MSBuild.Tasks/IkvmTaskMessageException.cs
index 4b2e2aeb8a..886da2df43 100644
--- a/src/IKVM.MSBuild.Tasks/IkvmTaskMessageException.cs
+++ b/src/IKVM.MSBuild.Tasks/IkvmTaskMessageException.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Runtime.Serialization;
 
 using IKVM.MSBuild.Tasks.Resources;
 
@@ -8,6 +9,7 @@ namespace IKVM.MSBuild.Tasks
     /// <summary>
     /// IKVM task exception with error message.
     /// </summary>
+    [Serializable]
     class IkvmTaskMessageException : IkvmTaskException
     {
 
@@ -52,4 +54,4 @@ public IkvmTaskMessageException(Exception innerException, string messageResource
 
     }
 
-}
\ No newline at end of file
+}