diff --git a/net/vtun/Makefile b/net/vtun/Makefile
index 524120e52..e8d4422d6 100644
--- a/net/vtun/Makefile
+++ b/net/vtun/Makefile
@@ -32,6 +32,7 @@ menu "Configuration"
         depends on PACKAGE_vtun
 
 config VTUN_config
+	bool
 
 	depends on PACKAGE_vtun
 	config VTUN_LZO