diff --git a/src/hx/atomic/AtomicInt.cpp b/src/hx/atomic/AtomicInt.cpp
index 99ad3cb7e..2c5162060 100644
--- a/src/hx/atomic/AtomicInt.cpp
+++ b/src/hx/atomic/AtomicInt.cpp
@@ -13,6 +13,13 @@ struct hx::atomic::AtomicInt_obj::Impl
 hx::atomic::AtomicInt_obj::AtomicInt_obj(int val) : impl(new Impl())
 {
 	impl->atomic.store(val);
+
+	GCSetFinalizer(this, [](hx::Object* obj)
+	{
+		auto a = reinterpret_cast<AtomicInt_obj*>(obj);
+
+		delete a->impl;
+	});
 }
 
 int hx::atomic::AtomicInt_obj::fetchAdd(int val)
diff --git a/src/hx/atomic/AtomicObject.cpp b/src/hx/atomic/AtomicObject.cpp
index d7babd200..d489f0a44 100644
--- a/src/hx/atomic/AtomicObject.cpp
+++ b/src/hx/atomic/AtomicObject.cpp
@@ -15,6 +15,13 @@ hx::atomic::AtomicObject_obj::AtomicObject_obj(Dynamic val) : impl(new Impl())
 	impl->atomic.store(val.mPtr);
 
 	HX_OBJ_WB_NEW_MARKED_OBJECT(this);
+
+	GCSetFinalizer(this, [](hx::Object* obj)
+	{
+		auto a = reinterpret_cast<AtomicObject_obj*>(obj);
+
+		delete a->impl;
+	});
 }
 
 void hx::atomic::AtomicObject_obj::__Mark(HX_MARK_PARAMS)