diff --git a/Userland/Libraries/LibIPC/Forward.h b/Userland/Libraries/LibIPC/Forward.h
index 70fdf9d909..ccdb977edb 100644
--- a/Userland/Libraries/LibIPC/Forward.h
+++ b/Userland/Libraries/LibIPC/Forward.h
@@ -13,5 +13,6 @@ class Dictionary;
 class Encoder;
 class Message;
 class File;
+class Stub;
 
 }