diff --git a/src/webimtray/WebIMTray/LockNotificationForm.cs b/src/webimtray/WebIMTray/LockNotificationForm.cs
index a38535d5..98385ed3 100644
--- a/src/webimtray/WebIMTray/LockNotificationForm.cs
+++ b/src/webimtray/WebIMTray/LockNotificationForm.cs
@@ -9,7 +9,7 @@ namespace webImTray {
     /// Base class for a form that wants to be notified of Windows
     /// session lock / unlock events
     /// </summary>
-    public abstract class LockNotificationForm : Form {
+    public class LockNotificationForm : Form {
         // from wtsapi32.h
         private const int NotifyForThisSession = 0;