diff --git a/sys/netgraph/netgraph.h b/sys/netgraph/netgraph.h
index e327920323a2..70472d7c9d3a 100644
--- a/sys/netgraph/netgraph.h
+++ b/sys/netgraph/netgraph.h
@@ -54,7 +54,9 @@
 #include <sys/module.h>
 #include <sys/mutex.h>
 
+#ifdef HAVE_KERNEL_OPTION_HEADERS
 #include "opt_netgraph.h"
+#endif
 
 /* debugging options */
 #define NG_SEPARATE_MALLOC	/* make modules use their own malloc types */