diff --git a/Userland/Libraries/LibWeb/Platform/Timer.cpp b/Userland/Libraries/LibWeb/Platform/Timer.cpp
index d3de49a958..01f015c6d0 100644
--- a/Userland/Libraries/LibWeb/Platform/Timer.cpp
+++ b/Userland/Libraries/LibWeb/Platform/Timer.cpp
@@ -17,7 +17,7 @@ NonnullRefPtr<Timer> Timer::create()
     return EventLoopPlugin::the().create_timer();
 }
 
-NonnullRefPtr<Timer> Timer::create_repeating(int interval_ms, Function<void()>&& timeout_handler)
+NonnullRefPtr<Timer> Timer::create_repeating(int interval_ms, JS::SafeFunction<void()>&& timeout_handler)
 {
     auto timer = EventLoopPlugin::the().create_timer();
     timer->set_single_shot(false);
@@ -26,7 +26,7 @@ NonnullRefPtr<Timer> Timer::create_repeating(int interval_ms, Function<void()>&&
     return timer;
 }
 
-NonnullRefPtr<Timer> Timer::create_single_shot(int interval_ms, Function<void()>&& timeout_handler)
+NonnullRefPtr<Timer> Timer::create_single_shot(int interval_ms, JS::SafeFunction<void()>&& timeout_handler)
 {
     auto timer = EventLoopPlugin::the().create_timer();
     timer->set_single_shot(true);
diff --git a/Userland/Libraries/LibWeb/Platform/Timer.h b/Userland/Libraries/LibWeb/Platform/Timer.h
index bde3ca3f3a..ff7ad6d19f 100644
--- a/Userland/Libraries/LibWeb/Platform/Timer.h
+++ b/Userland/Libraries/LibWeb/Platform/Timer.h
@@ -6,16 +6,16 @@
 
 #pragma once
 
-#include <AK/Function.h>
 #include <AK/RefCounted.h>
+#include <LibJS/SafeFunction.h>
 
 namespace Web::Platform {
 
 class Timer : public RefCounted<Timer> {
 public:
     static NonnullRefPtr<Timer> create();
-    static NonnullRefPtr<Timer> create_repeating(int interval_ms, Function<void()>&& timeout_handler);
-    static NonnullRefPtr<Timer> create_single_shot(int interval_ms, Function<void()>&& timeout_handler);
+    static NonnullRefPtr<Timer> create_repeating(int interval_ms, JS::SafeFunction<void()>&& timeout_handler);
+    static NonnullRefPtr<Timer> create_single_shot(int interval_ms, JS::SafeFunction<void()>&& timeout_handler);
 
     virtual ~Timer();
 
@@ -34,7 +34,7 @@ public:
     virtual bool is_single_shot() const = 0;
     virtual void set_single_shot(bool) = 0;
 
-    Function<void()> on_timeout;
+    JS::SafeFunction<void()> on_timeout;
 };
 
 }