diff --git a/libc/bionic/pthread_rwlock.cpp b/libc/bionic/pthread_rwlock.cpp
index 4f4c461..2b9be98 100644
--- a/libc/bionic/pthread_rwlock.cpp
+++ b/libc/bionic/pthread_rwlock.cpp
@@ -228,7 +228,7 @@
 
   memset(rwlock, 0, sizeof(pthread_rwlock_internal_t));
 
-  if (__predict_false(attr != NULL)) {
+  if (__predict_false(attr != nullptr)) {
     rwlock->pshared = __rwlockattr_getpshared(attr);
     int kind = __rwlockattr_getkind(attr);
     switch (kind) {