diff --git a/src/afs/FBSD/osi_machdep.h b/src/afs/FBSD/osi_machdep.h
index 6be21a41c7..d098c9603f 100644
--- a/src/afs/FBSD/osi_machdep.h
+++ b/src/afs/FBSD/osi_machdep.h
@@ -121,4 +121,6 @@ extern struct proc *afs_global_owner;
 #define USERPRI splx(splvar)
 #endif /* KERNEL */
 
+#define ifnet_flags(x) (x?(x)->if_flags:0)
+
 #endif /* _OSI_MACHDEP_H_ */