diff --git a/drivers/unix/thread_posix.cpp b/drivers/unix/thread_posix.cpp
index a81292d4a2e..ef3f5fb49c3 100644
--- a/drivers/unix/thread_posix.cpp
+++ b/drivers/unix/thread_posix.cpp
@@ -40,9 +40,13 @@
 #include "core/os/memory.h"
 #include "core/safe_refcount.h"
 
+static void _thread_id_key_destr_callback(void *p_value) {
+	memdelete(static_cast<Thread::ID *>(p_value));
+}
+
 static pthread_key_t _create_thread_id_key() {
 	pthread_key_t key;
-	pthread_key_create(&key, NULL);
+	pthread_key_create(&key, &_thread_id_key_destr_callback);
 	return key;
 }
 
@@ -63,7 +67,7 @@ void *ThreadPosix::thread_callback(void *userdata) {
 
 	ThreadPosix *t = reinterpret_cast<ThreadPosix *>(userdata);
 	t->id = atomic_increment(&next_thread_id);
-	pthread_setspecific(thread_id_key, (void *)t->id);
+	pthread_setspecific(thread_id_key, (void *)memnew(ID(t->id)));
 
 	ScriptServer::thread_enter(); //scripts may need to attach a stack
 
@@ -89,7 +93,14 @@ Thread *ThreadPosix::create_func_posix(ThreadCreateCallback p_callback, void *p_
 }
 Thread::ID ThreadPosix::get_thread_id_func_posix() {
 
-	return (ID)pthread_getspecific(thread_id_key);
+	void *value = pthread_getspecific(thread_id_key);
+
+	if (value)
+		return *static_cast<ID *>(value);
+
+	ID new_id = atomic_increment(&next_thread_id);
+	pthread_setspecific(thread_id_key, (void *)memnew(ID(new_id)));
+	return new_id;
 }
 void ThreadPosix::wait_to_finish_func_posix(Thread *p_thread) {
 
diff --git a/platform/android/thread_jandroid.cpp b/platform/android/thread_jandroid.cpp
index 98f6e79dcb4..9df9e57b24a 100644
--- a/platform/android/thread_jandroid.cpp
+++ b/platform/android/thread_jandroid.cpp
@@ -34,9 +34,13 @@
 #include "core/safe_refcount.h"
 #include "core/script_language.h"
 
+static void _thread_id_key_destr_callback(void *p_value) {
+	memdelete(static_cast<Thread::ID *>(p_value));
+}
+
 static pthread_key_t _create_thread_id_key() {
 	pthread_key_t key;
-	pthread_key_create(&key, NULL);
+	pthread_key_create(&key, &_thread_id_key_destr_callback);
 	return key;
 }
 
@@ -59,7 +63,7 @@ void *ThreadAndroid::thread_callback(void *userdata) {
 	setup_thread();
 	ScriptServer::thread_enter(); //scripts may need to attach a stack
 	t->id = atomic_increment(&next_thread_id);
-	pthread_setspecific(thread_id_key, (void *)t->id);
+	pthread_setspecific(thread_id_key, (void *)memnew(ID(t->id)));
 	t->callback(t->user);
 	ScriptServer::thread_exit();
 	return NULL;
@@ -80,7 +84,14 @@ Thread *ThreadAndroid::create_func_jandroid(ThreadCreateCallback p_callback, voi
 
 Thread::ID ThreadAndroid::get_thread_id_func_jandroid() {
 
-	return (ID)pthread_getspecific(thread_id_key);
+	void *value = pthread_getspecific(thread_id_key);
+
+	if (value)
+		return *static_cast<ID *>(value);
+
+	ID new_id = atomic_increment(&next_thread_id);
+	pthread_setspecific(thread_id_key, (void *)memnew(ID(new_id)));
+	return new_id;
 }
 
 void ThreadAndroid::wait_to_finish_func_jandroid(Thread *p_thread) {