diff --git a/Userland/Libraries/LibWeb/Painting/InlinePaintable.h b/Userland/Libraries/LibWeb/Painting/InlinePaintable.h
index 959333d59f..1afe78d4ba 100644
--- a/Userland/Libraries/LibWeb/Painting/InlinePaintable.h
+++ b/Userland/Libraries/LibWeb/Painting/InlinePaintable.h
@@ -66,4 +66,7 @@ private:
     Vector<PaintableFragment> m_fragments;
 };
 
+template<>
+inline bool Paintable::fast_is<InlinePaintable>() const { return is_inline_paintable(); }
+
 }