diff --git a/extensions/clientprefs/cookie.h b/extensions/clientprefs/cookie.h
index 8fe2376e..22fd26a9 100644
--- a/extensions/clientprefs/cookie.h
+++ b/extensions/clientprefs/cookie.h
@@ -139,7 +139,7 @@ public:
 
 private:
 	KTrie<Cookie *> cookieTrie;
-	SourceHook::List<CookieData *> clientData[MAXCLIENTS];
+	SourceHook::List<CookieData *> clientData[MAXCLIENTS+1];
 
 	bool connected[MAXCLIENTS+1];
 	bool statsLoaded[MAXCLIENTS+1];