diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index 72d83d186f..cdedc0a775 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -546,6 +546,7 @@ class WritableStream;
 class WritableStreamDefaultController;
 class WritableStreamDefaultWriter;
 
+struct PullIntoDescriptor;
 struct UnderlyingSink;
 struct UnderlyingSource;
 }