diff --git a/Meta/gn/secondary/Userland/Libraries/LibWeb/Internals/BUILD.gn b/Meta/gn/secondary/Userland/Libraries/LibWeb/Internals/BUILD.gn
index c97eb62c99a..aa4cc0b4355 100644
--- a/Meta/gn/secondary/Userland/Libraries/LibWeb/Internals/BUILD.gn
+++ b/Meta/gn/secondary/Userland/Libraries/LibWeb/Internals/BUILD.gn
@@ -3,6 +3,7 @@ source_set("Internals") {
   deps = [ "//Userland/Libraries/LibWeb:all_generated" ]
   sources = [
     "Inspector.cpp",
+    "InternalAnimationTimeline.cpp",
     "Internals.cpp",
   ]
 }
diff --git a/Meta/gn/secondary/Userland/Libraries/LibWeb/idl_files.gni b/Meta/gn/secondary/Userland/Libraries/LibWeb/idl_files.gni
index 28ab9687c84..ccd8142701a 100644
--- a/Meta/gn/secondary/Userland/Libraries/LibWeb/idl_files.gni
+++ b/Meta/gn/secondary/Userland/Libraries/LibWeb/idl_files.gni
@@ -223,6 +223,7 @@ standard_idl_files = [
   "//Userland/Libraries/LibWeb/HTML/WorkerLocation.idl",
   "//Userland/Libraries/LibWeb/HTML/WorkerNavigator.idl",
   "//Userland/Libraries/LibWeb/Internals/Inspector.idl",
+  "//Userland/Libraries/LibWeb/Internals/InternalAnimationTimeline.idl",
   "//Userland/Libraries/LibWeb/Internals/Internals.idl",
   "//Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.idl",
   "//Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserverEntry.idl",