diff --git a/src/unix/bsd/freebsdlike/dragonfly/mod.rs b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
index c694b6e90c72264c6f96c291578ade30091f93d2..38204c2272528bfddb030684a22385927a994f18 100644
--- a/src/unix/bsd/freebsdlike/dragonfly/mod.rs
+++ b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
@@ -340,6 +340,7 @@ pub const EVFILT_VNODE: ::int16_t = -4;
 pub const EVFILT_PROC: ::int16_t = -5;
 pub const EVFILT_SIGNAL: ::int16_t = -6;
 pub const EVFILT_TIMER: ::int16_t = -7;
+pub const EVFILT_EXCEPT: ::int16_t = -8;
 pub const EVFILT_USER: ::int16_t = -9;
 pub const EVFILT_FS: ::int16_t = -10;