diff --git a/source/libtun/adapter.d b/source/libtun/adapter.d
index 4eeb682..57bb180 100644
--- a/source/libtun/adapter.d
+++ b/source/libtun/adapter.d
@@ -1,7 +1,7 @@
 module libtun.adapter;
 
-extern (C) int ioctl(int fd, ulong request, void* data);
-extern (C) int open(char* path, int flags);
+// extern (C) int ioctl(int fd, ulong request, void* data);
+// extern (C) int open(char* path, int flags);
 
 import core.stdc.stdio;