diff --git a/Tests/LibWeb/Text/expected/window-proxy-property-inline-cache.txt b/Tests/LibWeb/Text/expected/window-proxy-property-inline-cache.txt
new file mode 100644
index 00000000000..370fd29745e
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/window-proxy-property-inline-cache.txt
@@ -0,0 +1,2 @@
+123
+undefined
diff --git a/Tests/LibWeb/Text/input/window-proxy-property-inline-cache.html b/Tests/LibWeb/Text/input/window-proxy-property-inline-cache.html
new file mode 100644
index 00000000000..af005f95615
--- /dev/null
+++ b/Tests/LibWeb/Text/input/window-proxy-property-inline-cache.html
@@ -0,0 +1,13 @@
+<script src="include.js"></script>
+<script>
+    test(() => {
+        function ic(o) {
+            return o.foo
+        }
+
+        window.foo = 123
+        println(ic(window))
+        delete window.foo
+        println(ic(window))
+    });
+</script>
diff --git a/Userland/Libraries/LibWeb/HTML/WindowProxy.cpp b/Userland/Libraries/LibWeb/HTML/WindowProxy.cpp
index 7cf010ece5e..4554c0157aa 100644
--- a/Userland/Libraries/LibWeb/HTML/WindowProxy.cpp
+++ b/Userland/Libraries/LibWeb/HTML/WindowProxy.cpp
@@ -144,7 +144,7 @@ JS::ThrowCompletionOr<bool> WindowProxy::internal_define_own_property(JS::Proper
 }
 
 // 7.4.7 [[Get]] ( P, Receiver ), https://html.spec.whatwg.org/multipage/window-object.html#windowproxy-get
-JS::ThrowCompletionOr<JS::Value> WindowProxy::internal_get(JS::PropertyKey const& property_key, JS::Value receiver, JS::CacheablePropertyMetadata* cacheable_metadata) const
+JS::ThrowCompletionOr<JS::Value> WindowProxy::internal_get(JS::PropertyKey const& property_key, JS::Value receiver, JS::CacheablePropertyMetadata*) const
 {
     auto& vm = this->vm();
 
@@ -156,7 +156,7 @@ JS::ThrowCompletionOr<JS::Value> WindowProxy::internal_get(JS::PropertyKey const
     // 3. If IsPlatformObjectSameOrigin(W) is true, then return ? OrdinaryGet(this, P, Receiver).
     // NOTE: this is passed rather than W as OrdinaryGet and CrossOriginGet will invoke the [[GetOwnProperty]] internal method.
     if (is_platform_object_same_origin(*m_window))
-        return JS::Object::internal_get(property_key, receiver, cacheable_metadata);
+        return JS::Object::internal_get(property_key, receiver);
 
     // 4. Return ? CrossOriginGet(this, P, Receiver).
     // NOTE: this is passed rather than W as OrdinaryGet and CrossOriginGet will invoke the [[GetOwnProperty]] internal method.