diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStreamGenericReader.cpp b/Userland/Libraries/LibWeb/Streams/ReadableStreamGenericReader.cpp
index 56824f0b70..20c5ce397f 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStreamGenericReader.cpp
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStreamGenericReader.cpp
@@ -45,6 +45,7 @@ void ReadableStreamGenericReaderMixin::visit_edges(JS::Cell::Visitor& visitor)
 {
     visitor.visit(m_closed_promise);
     visitor.visit(m_stream);
+    visitor.visit(m_realm);
 }
 
 }