diff --git a/headers/posix/pthread.h b/headers/posix/pthread.h
index cd9f722807..5d976a911f 100644
--- a/headers/posix/pthread.h
+++ b/headers/posix/pthread.h
@@ -21,7 +21,7 @@ typedef struct  _pthread_barrier		*pthread_barrier_t;
 typedef struct  _pthread_barrierattr	*pthread_barrierattr_t;
 typedef struct  _pthread_spinlock	*pthread_spinlock_t;
 
-struct pthread_once {
+struct _pthread_once {
 	int	state;
 	pthread_mutex_t mutex;
 };