diff --git a/tun/tun_netbsd.go b/tun/tun_netbsd.go
index f95bfce..a5bc9db 100644
--- a/tun/tun_netbsd.go
+++ b/tun/tun_netbsd.go
@@ -157,7 +157,7 @@ func CreateTUN(name string, mtu int) (Device, error) {
 
 	if errno != 0 {
 		tunfile.Close()
-		return nil, fmt.Errorf("Unable to put into IFHEAD mode: %v", errno)
+		return nil, fmt.Errorf("Unable to put into multi-af mode: %v", errno)
 	}
 
 	_, _, errno = unix.Syscall(
@@ -169,7 +169,7 @@ func CreateTUN(name string, mtu int) (Device, error) {
 
 	if errno != 0 || ifheadmode == 0 {
 		tunfile.Close()
-		return nil, fmt.Errorf("Unable to validate IFHEAD mode: %v (ifheadmode = %d)", errno, ifheadmode)
+		return nil, fmt.Errorf("Unable to validate multi-af mode: %v", errno)
 	}
 
 	if err == nil && name == "tun" {