diff --git a/Subscription.h b/Subscription.h
index c95705d..2ce5da7 100644
--- a/Subscription.h
+++ b/Subscription.h
@@ -2,6 +2,7 @@
 #define __Subscription_h__
 
 #include "SubscriptionHandler.h"
+#include "SessionFilter.h"
 #include "ZString.h"
 #include <string>
 #include <vector>