diff --git a/libretro-common/queues/task_queue.c b/libretro-common/queues/task_queue.c
index 6441b54efd..9bf680c7c2 100644
--- a/libretro-common/queues/task_queue.c
+++ b/libretro-common/queues/task_queue.c
@@ -66,7 +66,7 @@ static struct retro_task_impl *impl_current = NULL;
 static bool task_threaded_enable            = false;
 
 #ifdef HAVE_THREADS
-static uintptr_t main_thread_id             = NULL;
+static uintptr_t main_thread_id             = 0;
 static slock_t *running_lock                = NULL;
 static slock_t *finished_lock               = NULL;
 static slock_t *property_lock               = NULL;