diff --git a/libc/include/pthread.h b/libc/include/pthread.h
index 86a1005..c32890b 100644
--- a/libc/include/pthread.h
+++ b/libc/include/pthread.h
@@ -206,10 +206,10 @@
 
 int pthread_mutex_destroy(pthread_mutex_t*) __nonnull((1));
 int pthread_mutex_init(pthread_mutex_t*, const pthread_mutexattr_t*) __nonnull((1));
-int pthread_mutex_lock(pthread_mutex_t*) __nonnull((1));
+int pthread_mutex_lock(pthread_mutex_t*) /* __nonnull((1)) */;
 int pthread_mutex_timedlock(pthread_mutex_t*, const struct timespec*) __nonnull((1, 2));
 int pthread_mutex_trylock(pthread_mutex_t*) __nonnull((1));
-int pthread_mutex_unlock(pthread_mutex_t*) __nonnull((1));
+int pthread_mutex_unlock(pthread_mutex_t*) /* __nonnull((1)) */;
 
 int pthread_once(pthread_once_t*, void (*)(void)) __nonnull((1, 2));