diff --git a/tools/lkl/lib/posix-host.c b/tools/lkl/lib/posix-host.c
index db63ed7e35fb19..f1ae3a2e6dbb37 100644
--- a/tools/lkl/lib/posix-host.c
+++ b/tools/lkl/lib/posix-host.c
@@ -186,7 +186,7 @@ static void mutex_free(struct lkl_mutex *_mutex)
 static lkl_thread_t thread_create(void (*fn)(void *), void *arg)
 {
 	pthread_t thread;
-	if (WARN_PTHREAD(pthread_create(&thread, NULL, (void* (*)(void *))fn, arg)))
+	if (WARN_PTHREAD(pthread_create(&thread, NULL, (void *)fn, arg)))
 		return 0;
 	else
 		return (lkl_thread_t) thread;
@@ -267,7 +267,7 @@ static void *timer_alloc(void (*fn)(void *), void *arg)
 		.sigev_value = {
 			.sival_ptr = arg,
 		},
-		.sigev_notify_function = (void (*)(union sigval))fn,
+		.sigev_notify_function = (void (*)())fn,
 	};
 
 	err = timer_create(CLOCK_REALTIME, &se, &timer);