3 files changed, 7 insertions, 0 deletions
diff --git a/Libraries/LibWeb/DOM/Timer.cpp b/Libraries/LibWeb/DOM/Timer.cpp
index a9bf2dcd4b..04e3c778f5 100644
--- a/Libraries/LibWeb/DOM/Timer.cpp
+++ b/Libraries/LibWeb/DOM/Timer.cpp
@@ -54,6 +54,7 @@ Timer::Timer(Window& window, Type type, int milliseconds, JS::Function& callback
 
 Timer::~Timer()
 {
+    m_window.deallocate_timer_id({}, m_id);
 }
 
 }
diff --git a/Libraries/LibWeb/DOM/Window.cpp b/Libraries/LibWeb/DOM/Window.cpp
index e651a524ee..615d0ca679 100644
--- a/Libraries/LibWeb/DOM/Window.cpp
+++ b/Libraries/LibWeb/DOM/Window.cpp
@@ -108,6 +108,11 @@ i32 Window::allocate_timer_id(Badge<Timer>)
     return m_timer_id_allocator.allocate();
 }
 
+void Window::deallocate_timer_id(Badge<Timer>, i32 id)
+{
+    m_timer_id_allocator.deallocate(id);
+}
+
 void Window::clear_timeout(i32 timer_id)
 {
     m_timers.remove(timer_id);
diff --git a/Libraries/LibWeb/DOM/Window.h b/Libraries/LibWeb/DOM/Window.h
index 3602b1d5c8..7de6cbacf5 100644
--- a/Libraries/LibWeb/DOM/Window.h
+++ b/Libraries/LibWeb/DOM/Window.h
@@ -74,6 +74,7 @@ public:
     void set_wrapper(Badge<Bindings::WindowObject>, Bindings::WindowObject&);
 
     i32 allocate_timer_id(Badge<Timer>);
+    void deallocate_timer_id(Badge<Timer>, i32);
     void timer_did_fire(Badge<Timer>, Timer&);
 
     HighResolutionTime::Performance& performance() { return *m_performance; }