diff --git a/core/observer.h b/core/observer.h
index 76fb20716..32909dc78 100644
--- a/core/observer.h
+++ b/core/observer.h
@@ -28,9 +28,10 @@ namespace Okular {
 #define PROGRESSWIDGET_ID 8
 #define PAGESIZELABEL_ID 9
 #define BOOKMARKLIST_ID 10
+#define ANNOTATIONMODEL_ID 11
 
 // the biggest id, useful for ignoring wrong id request
-#define MAX_OBSERVER_ID 11
+#define MAX_OBSERVER_ID 12
 
 /** PRIORITIES for requests. Globally defined here. **/
 #define PAGEVIEW_PRIO 1