diff --git a/src/have.h b/src/have.h
index 9dc3b04c..88733a1e 100644
--- a/src/have.h
+++ b/src/have.h
@@ -206,6 +206,10 @@
 #include <resolv.h>
 #endif
 
+#ifdef HAVE_LINUX_IF_TUN_H
+#include <linux/if_tun.h>
+#endif
+
 #ifdef STATUS
 #undef STATUS
 #endif