Index: boringtun/boringtun/src/sleepyinstant/unix.rs
--- boringtun/boringtun/src/sleepyinstant/unix.rs.orig
+++ boringtun/boringtun/src/sleepyinstant/unix.rs
@@ -7,6 +7,7 @@ use nix::time::{clock_gettime, ClockId};
     target_os = "macos",
     target_os = "ios",
     target_os = "tvos",
+    target_os = "openbsd",
     target_os = "freebsd"
 ))]
 const CLOCK_ID: ClockId = ClockId::CLOCK_MONOTONIC;
@@ -14,6 +15,7 @@ const CLOCK_ID: ClockId = ClockId::CLOCK_MONOTONIC;
     target_os = "macos",
     target_os = "ios",
     target_os = "tvos",
+    target_os = "openbsd",
     target_os = "freebsd"
 )))]
 const CLOCK_ID: ClockId = ClockId::CLOCK_BOOTTIME;
