diff --git a/libc/include/sys/klog.h b/libc/include/sys/klog.h
index b33d11b..b60c2c4 100644
--- a/libc/include/sys/klog.h
+++ b/libc/include/sys/klog.h
@@ -66,6 +66,6 @@
  * This system call is not available to applications.
  * Use syslog() or `<android/log.h>` instead.
  */
-int klogctl(int __type, char* __buf, int __buf_size);
+int klogctl(int __type, char* __BIONIC_COMPLICATED_NULLNESS __buf, int __buf_size);
 
 __END_DECLS