diff --git a/sys/kern/kern_tc.c b/sys/kern/kern_tc.c
index 4567dde2c07..f9b54a06298 100644
--- a/sys/kern/kern_tc.c
+++ b/sys/kern/kern_tc.c
@@ -618,7 +618,7 @@ pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps)
 		return (EOPNOTSUPP);
 #endif
 	default:
-		return (ENOTTY);
+		return (ENOIOCTL);
 	}
 }