diff --git a/Userland/Services/WindowServer/SystemEffects.h b/Userland/Services/WindowServer/SystemEffects.h
index bb686ce35f..b765696245 100644
--- a/Userland/Services/WindowServer/SystemEffects.h
+++ b/Userland/Services/WindowServer/SystemEffects.h
@@ -6,7 +6,9 @@
 
 #pragma once
 
+#include <AK/StringView.h>
 #include <AK/Types.h>
+#include <AK/Vector.h>
 
 namespace WindowServer {