diff --git a/libc/include/pthread.h b/libc/include/pthread.h
index a43e47c80..27e13e497 100644
--- a/libc/include/pthread.h
+++ b/libc/include/pthread.h
@@ -233,7 +233,7 @@ typedef struct {
     void*            reserved[4];  /* for future extensibility */
 } pthread_rwlock_t;
 
-#define PTHREAD_RWLOCK_INITIALIZER  { PTHREAD_MUTEX_INITIALIZER, 0, NULL, 0, 0 }
+#define PTHREAD_RWLOCK_INITIALIZER  { PTHREAD_MUTEX_INITIALIZER, PTHREAD_COND_INITIALIZER, 0, 0, 0, 0, { NULL, NULL, NULL, NULL } }
 
 int pthread_rwlockattr_init(pthread_rwlockattr_t *attr);
 int pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr);