diff --git a/src/os/unix/ngx_darwin.h b/src/os/unix/ngx_darwin.h
index 7fa60ff..ebd8d35 100644
--- a/src/os/unix/ngx_darwin.h
+++ b/src/os/unix/ngx_darwin.h
@@ -8,6 +8,7 @@
 #define _NGX_DARWIN_H_INCLUDED_
 
 
+void ngx_debug_init(void);
 ngx_chain_t *ngx_darwin_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in,
     off_t limit);
 
@@ -15,5 +16,7 @@
 extern int       ngx_darwin_hw_ncpu;
 extern u_long    ngx_darwin_net_inet_tcp_sendspace;
 
+extern ngx_uint_t  ngx_debug_malloc;
+
 
 #endif /* _NGX_DARWIN_H_INCLUDED_ */