diff --git a/src/intcmp.rs b/src/intcmp.rs
index f504b50..b304ac0 100644
--- a/src/intcmp.rs
+++ b/src/intcmp.rs
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2023–2024 DTB <trinity@trinity.moe>
+ * Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
  * SPDX-License-Identifier: AGPL-3.0-or-later
  *
  * This program is free software: you can redistribute it and/or modify it under
@@ -22,11 +23,18 @@ use std::{
 };
 
 extern crate getopt;
-use getopt::GetOpt;
-
 extern crate sysexits;
+
+use getopt::GetOpt;
 use sysexits::EX_USAGE;
 
+#[cfg(target_os="openbsd")] use sysexits::EX_OSERR;
+#[cfg(target_os="openbsd")] extern crate openbsd;
+#[cfg(target_os="openbsd")] extern crate strerror;
+#[cfg(target_os="openbsd")] use openbsd::{ Promises, pledge };
+#[cfg(target_os="openbsd")] use strerror::StrError;
+
+
 fn usage(s: &str) -> ExitCode {
 	eprintln!("Usage: {} [-egl] integer integer...", s);
 	ExitCode::from(EX_USAGE as u8)
@@ -34,6 +42,15 @@ fn usage(s: &str) -> ExitCode {
 
 fn main() -> ExitCode {
 	let argv = args().collect::<Vec<String>>();
+
+	if cfg!(target_os="openbsd") {
+		let promises = Promises::new("stdio");
+		if let Err(e) = pledge(Some(promises), None) {
+			eprintln!("{}: {}", argv[0], e.strerror());
+			return ExitCode::from(EX_OSERR as u8);
+		}
+	}
+
 	let mut e = false; /* args can be == */
 	let mut g = false; /* args can be > */
 	let mut l = false; /* args can be < */
@@ -46,11 +63,13 @@ fn main() -> ExitCode {
 			Ok("e") => e = true,
 			Ok("g") => g = true,
 			Ok("l") => l = true,
-			_ => { return usage(&argv[0]); },
+			_ => return usage(&argv[0]),
 		}
 		optind = opt.ind();
 	}
 
+	if !e & !g & !l { return usage(&argv[0]); }
+
 	if argv.len() - optind < 2 /* see usage */ { return usage(&argv[0]); }
 
 	let mut prev: Option<usize> = None; /* no previous operand */
@@ -59,8 +78,8 @@ fn main() -> ExitCode {
 	for arg in argv.iter().skip(optind) { /* iterate operands */
 		match arg.parse::<usize>() { /* parse current operand */
 			Ok(n) => currn = n,
-			_ => {
-				eprintln!("{}: {}: Invalid integer", &argv[0], arg);
+			Err(e) => {
+				eprintln!("{}: {}: {}", &argv[0], arg, e);
 				return ExitCode::from(EX_USAGE as u8);
 			}
 		}