diff --git a/os_info/src/bitness.rs b/os_info/src/bitness.rs
index 16b4dc76..5043f645 100644
--- a/os_info/src/bitness.rs
+++ b/os_info/src/bitness.rs
@@ -4,6 +4,7 @@ use std::fmt::{self, Display, Formatter};
 #[cfg(any(
     target_os = "dragonfly",
     target_os = "freebsd",
+    target_os = "illumos",
     target_os = "linux",
     target_os = "macos",
     target_os = "netbsd",